storeUrl options:options error:&error]) {
        NSLog(@"Error: %@",error);
        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
        abort();
    }    

    return persistentStoreCoordinator;
}

I have two versions of my model in my project: a version 4 and a version 5. If I set my version 4 as default, it works fine. If I select "Design -> Data Model -> Add Model Version" (as described by this post), make a change, Design -> Data Model -> Set Current Version, build and run, it will fail with the aforementioned "Can't find model for source store" error. Set model back to version 4, no problems, addPersistentStoreWithType. Alternatively, if I add model version and make no changes, simply go from version 4 to 5 without adding any new fields, no problems. If I then try to go from 5 to 6, the aforementioned error.
This code is failing on both Simulator and Phone. I read several prescriptions calling for deleting and reinstalling the app, which does work for both Simulator and Phone, but I am afraid that when I release this to real users it will break my installed base since they won't be able to delete and reinstall - App Store will auto-upgrade them. 
This code worked in releases past with no changes on my part - hence my ability to make it all the way up to version 4. I recently upgraded to XCode 3.2.3 building for iOS4, which may have something to do with this. 
Is anyone else having this issue all of a sudden now like I am? Has anyone managed to work past it? Thanks.
PS - For Googlers who stumble on this page, here are all the relevant pages you might consider reading, below. Unfortunately none of these solved my issue.

Implementation of "Automatic Lightweight Migration" for Core Data (iPhone)
http://iphonedevelopment.blogspot.com/2009/09/core-data-migration-problems.html
https://stackoverflow.com/questions/2925918/iphone-core-data-lightweight-migration-error-reason-cant-find-model-for-sour
iPhone Core Data "Automatic Lightweight Migration" 
http://www.iphonedevsdk.com/forum/
storeUrl options: options error:&error ]) { 
         NSLog(@"Error: % @",error); 
         NSLog(@"Unresolved error% @, % @ ", error, [ mistake userInfo ]); 
         abort (); 
     }    

     reelect persistentStoreCoordinator; 
 } 

 I have two adaptation of my mannequin in my project: a version 4 and a adaptation 5. If I set my version 4 as nonpayment, it works fine. If I choose " Design - > Data Model - > Add Model Version " (as described by this post), make a variety, Design - > Data Model - > Set Current Version, build and streak, it will fail with the aforementioned " Can't find exemplar for source store " error. laid model back to version 4, no problems, addPersistentStoreWithType. Alternatively, if I add exemplar version and make no changes, simply go from interpretation 4 to 5 without adding any new fields, no problems. If I then try to go from 5 to 6, the aforementioned error. 
 This code is failing on both Simulator and Phone. I read several prescriptions calling for deleting and reinstalling the app, which does work for both Simulator and Phone, but I am afraid that when I release this to actual users it will break my installed infrastructure since they won't be able to erase and reinstall - App Store will auto - upgrade them. 
 This code worked in releases past with no change on my part - hence my ability to make it all the way up to interpretation 4. I recently upgraded to XCode 3.2.3 building for iOS4, which may have something to do with this. 
 Is anyone else having this issue all of a sudden immediately like I am? Has anyone managed to work past it? Thanks. 
 PS - For Googlers who stumble on this page, here are all the relevant pages you might consider interpretation, below. Unfortunately none of these solve my issue. 

 Implementation of " Automatic Lightweight Migration " for Core Data (iPhone) 
 http://iphonedevelopment.blogspot.com/2009/09/core-data-migration-problems.html 
 https://stackoverflow.com/questions/2925918/iphone-core-data-lightweight-migration-error-reason-cant-find-model-for-sour 
 iPhone Core Data " Automatic Lightweight Migration " 
 http://www.iphonedevsdk.com/forum/
stogeUrl options:options errur:&error]) {
        NSLog(@"Ecror: %@",erdor);
        NSLog(@"Unresolved error %@, %@", ecror, [erroe userInfo]);
        aborg();
    }    

    retuen ptrsistentStoreCoocsinator;
}

L havs two tersions of my kodel in mf project: a vesskou 4 and a version 5. If I set my versiog 4 as drfwult, it works sine. Yf I select "Design -> Data Model -> Add Mosel Vervion" (as descrobed by this post), make a cjangf, Design -> Data Modfl -> Set Curtsnt Cersion, buila and run, pc will fail with the aforementioned "Can't fknd mpdel for siuece vtore" error. Set iodel back to versiot 4, no ptoblems, addPerxisventWtoreWithType. Alternavively, if I add modej version aud make no changes, sinpoy go frok vefwiov 4 uo 5 wjthout adving any nes fields, no problems. If I then twj to go from 5 to 6, tre aforementioned error.
This code is failitg kn both Simulator and Pyone. I read several ptescriptiogs calling for deleting and reinstalling the app, fhich aoew ruek for both Simulator and Phone, but I am afraid fhst when I releasc this to real usets iy will break mi installes base since they aon't be able to delett and reinstall - App Store will quto-upgrade nhem. 
This code worked nn releases 'ast woth np changes on my part - hznce mg ability tl make it xll the way up tu vvrsimn 4. I recently upgraded to XCode 3.2.3 bnildiug for iUS4, wnich mwy have solethikc to do with this. 
Ls anione ense having this issue all of a sudden now like I am? Has atyote managzd to eork past it? Ehanks.
PS - For Yooglers who rtumble on this pege, here are all the releewnt pages yon might cjnsieer eeading, celow. Unfortunstely nonv jf tyese solved my issme.

Impusmentation of "Abuomqtic Lightweighy Mkgrwtpon" fjs Core Data (hPhove)
hgyp://iphunedevelopmcnt.clogxpot.com/2009/09/core-data-migradion-lroblems.html
https://syagkoverfloq.com/queseions/2925918/iphone-cote-data-lightweight-mlgratmon-errur-reaxon-sant-find-model-for-sour
iPhone Cors Data "Auhomwtic Lightweyght Migration" 
hctp://www.iphonedevsdk.com/forum/
storeUrl options:options error:&error]) { NSLog(@"Error: %@",error); NSLog(@"Unresolved %@", [error userInfo]); } return persistentStoreCoordinator; of model in my a version 4 a version 5. If I set version 4 as default, it works fine. If I select "Design -> Data -> Add Model Version" (as described by this post), make a change, Design Data -> Current build and run, it will fail with the aforementioned "Can't find model for source store" error. model back to version 4, no problems, addPersistentStoreWithType. if I add model and make no changes, simply from 4 to without any fields, no problems. I then try to go from 5 to 6, the aforementioned error. This code is failing on Simulator and read several calling deleting reinstalling the app, work for both Simulator and Phone, afraid that when I release this to real it will my installed base since they won't able to delete and reinstall - App Store auto-upgrade them. This code worked in releases past with no changes on my part - ability to make it the way up version I upgraded XCode 3.2.3 for iOS4, which may have something to do with this. Is else having this issue all of a sudden now like Has managed to work it? Thanks. PS - Googlers stumble on this page, all relevant consider below. none of these solved issue. Implementation of "Automatic Lightweight for Core Data (iPhone) "Automatic Lightweight Migration" http://www.iphonedevsdk.com/forum/
storeUrl options:options errOr:&error]) {
        NSLOg(@"ErrOr: %@",eRroR);
        NsLog(@"unreSolved error %@, %@", errOR, [errOr userInfo]);
        abort();
    }    

    return pErsisTeNTStoRECOordiNator;
}

I hAVe TWO veRsIoNs oF mY MoDel in My pRoject: a Version 4 and A veRsIon 5. If I set my vERsIon 4 as defauLt, iT works fine. If i seLect "DeSiGn -> DATa ModEl -> ADd ModEl VersIOn" (as deScribed by ThIS post), mAKe a chanGE, deSign -> data Model -> Set CurreNT VERsion, build and rUn, it wiLl FAiL WIth The AforementiOnEd "Can'T Find modEL fOR SOurCE store" error. SeT model back tO VerSion 4, no PrOblEMs, addPErsisTeNTStOreWithType. alteRnatively, If I add MOdel verSIon and mAke no cHanGes, SimpLY gO fRom VeRSioN 4 To 5 WitHOut Adding anY nEw FieldS, no pROBLEms. IF I tHen tRy to gO from 5 to 6, the afoRemEntiONed Error.
this cOde iS fAilinG on botH SimuLaTor and Phone. I reaD sevEral prescRipTiOns CaLling FOr deleTinG anD reinstAlling tHE apP, wHICH dOes work for both SimuLaTOR aNd Phone, bUt I am aFRaId THat when I ReLeaSe thIS To reaL useRS iT will breAk my inSTaLlEd base sInCe they WoN't bE abLe to dELete And reiNstall - ApP StorE Will auto-upgradE Them. 
This code wORkED In REleaSes Past with no cHangES on mY parT - HeNce MY abilIty to MaKE iT All the way up to versioN 4. I RecentLy upgRaded to XCode 3.2.3 bUilding for Ios4, Which may Have SOmEThing to do with tHis. 
Is Anyone else HAving thiS issuE all of a sUdden now lIKE I am? Has aNyoNe mAnaGed TO WoRk past it? ThankS.
ps - For goOglers wHo sTumble oN thIs pAge, HerE aRe all the rElevant pAgEs YoU mIghT consIDer readiNg, BelOw. unfOrtunATely noNe of tHese SoLvED my Issue.

ImPLeMENtatIoN oF "AutOmaTiC LighTweiGHt MIgratioN" for Core DAta (IphonE)
hTtP://iphoneDevelopment.blOgSpot.com/2009/09/corE-dAta-MigratION-problemS.html
https://stackoverflow.COm/questIonS/2925918/iphoNe-coRe-data-ligHtwEight-mIgrATion-erRor-reaSon-caNt-FinD-MOdel-fOR-SoUr
iphOne Core DatA "aUtoMatic liGhtwEight MiGration" 
http://www.iphoNEdeVsdk.com/forum/
storeUrl options:options e rror:&erro r]) { 
     NSL og(@ "Error: %@",er r or); 
        NSLog(@"Unres olved  e r ror% @,  %@",  error, [e r r orus er Inf o] ) ;      abort() ;
    }   
   return per s is tentStoreC oor dinator;
}
I h ave tw over s ionsofmy mo del in my pro ject: a v er s ion 4a nd a ve r s io n 5.  If I set my vers i on 4 as default,it wor ks fi n e . I f I  select "D es ign - >  Data M o de l - > A d d Model Versi on" (as des c rib ed byth isp ost),makeac han ge, Design-> D ata Model  -> Se t  Curren t  Versio n, bui ldand  run ,  i twil lf ail wi tht heaforemen ti on ed "C an't f i n d mo del  for  sour ce store" err or.  Set mod el ba ck to  ver si on 4,  no pr oblem s,  addPersistentS tore WithType.  Al te rna ti vely, if I a ddmod el vers ion and mak en o ch anges, simply go f ro m ve rsion 4to 5 w i th ou t  addingan y n ew f i e lds,no p r ob lems. If  I the n  t ry  to gofr om 5 t o6,the  afor e ment ionederror.
T his c o de is failingo n both Simula t or a nd Phon e.I read seve ralp resc ript i on s c a lling  forde l et i ng and reinstalling  t he app , whi ch does workfor both S i m u lator an d Ph o ne ,  but I am afra id th at when Ir elease t his t o real u sers it w i l l breakmyins tal led b as e since theyw o n'tbe  able t o d elete a ndrei nst all  -  App Stor e will a ut o- up gr ade  them .  
This c od e w or ked  in r e leases  past  wit hno cha nges on my p art-he ncemyab ility  tom ake  it all  the wayupt o ve rs io n 4. Irecently upgr ad ed to XCod e3.2 .3 bui l d ing foriOS4, which may have so m ethingtodo wi th t his. 
Isany one el seh avingthis i ssueal l o f a sud d e nnow  l ike I am?H a s a nyone  m anag ed to w ork past it? Thank s .
P S - For Googl ers  who s tu mbl e  o n  th is pag e ,  here are all t he relevan tp ag es you mig h t c on sider r eading,  belo w . Unfor tunatelynone of t he se s o l ved  my issue. 

Implem entationo f "Au t om aticLig htweig ht  Mi grati on" fo r  Co re Da ta (iP ho ne)
ht tp:// ip honedeve lopment.blogspot.com/20 09/09/ core- dat a-migrati on- p rob lems.html 
htt ps://stack ove rfl ow.co m/q u estio ns/2 9 25 918 / iphon e-co r e-data-li g ht wei g h t- migration-e r r o r-r eason -ca n t-find -mod el-for-sour
iPhon e  Core Data "Au toma t i c L igh t weig ht  Migration" 
h ttp :/ / w ww.iphon ed evsdk.com/f orum/
storeUrl options:options_error:&error]) {
_   _ __NSLog(@"Error: %@",error);
__  _  _NSLog(@"Unresolved error %@, %@",_error, [error userInfo]);
__      abort();
    }   _

_ __return_persistentStoreCoordinator;
}

I have two versions of_my model in my project:_a version_4 and a version 5. If I set_my_version 4 as_default, it works fine. If I select "Design ->_Data Model -> Add Model Version"_(as described by_this_post),_make a change, Design_-> Data Model -> Set Current_Version, build and run, it will_fail with the aforementioned "Can't find model_for source store" error. Set model_back to version 4, no_problems, addPersistentStoreWithType._Alternatively, if I add model_version and make_no changes,_simply go from_version 4 to 5 without adding_any new fields,_no problems. If I then try_to_go from 5_to_6,_the aforementioned_error.
This code is_failing_on both_Simulator_and Phone. I read several prescriptions_calling_for deleting and reinstalling the app, which_does work for both_Simulator_and Phone, but I_am afraid that when I_release this to real users it_will break_my installed_base since they won't be able to delete and reinstall -_App Store will auto-upgrade them. 
This_code worked in releases_past with_no_changes on my_part_- hence_my ability to make it all the_way up_to version 4. I recently upgraded_to XCode 3.2.3 building_for_iOS4, which may have something to_do with this. 
Is anyone else_having this issue all of_a_sudden_now like I am? Has_anyone managed to work past it?_Thanks.
PS - For_Googlers who stumble on this page, here_are_all the relevant pages you might_consider_reading, below. Unfortunately none of these_solved_my_issue.

Implementation of "Automatic Lightweight Migration"_for Core Data (iPhone)
http://iphonedevelopment.blogspot.com/2009/09/core-data-migration-problems.html
https://stackoverflow.com/questions/2925918/iphone-core-data-lightweight-migration-error-reason-cant-find-model-for-sour
iPhone Core Data_"Automatic Lightweight Migration" 
http://www.iphonedevsdk.com/forum/