
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"qgXmHuloO7rKfYIUXFH5PVjsLDjpYcNDsX6gIff71a4n+Ehe/uu7DOt29+50S8B11TZp1uxaxf3+BqgSuHp+3Q==", "investor"=>{"name"=>"Emmanuel", "email"=>"lalapnt@yahoo.com", "country"=>"Poland", "phone"=>"000000000"}, "commit"=>"I'm interested!"}
  Rendered shared/_error_messages.html.erb (1.1ms)
  Rendered investors/new.html.erb within layouts/application (7.9ms)
Completed 200 OK in 163ms (Views: 162.7ms | ActiveRecord: 0.0ms)

It looks like you're submitting a form to /investors/new but as a GET and not a POST, thus calling the #show action of /investors/new, rather than #create at /investors/new.
The raw HTML made me look closer - you have two form tags:
<form div class="small-6 large-centered columns">
    <fieldset>
        <legend> Enter your best details</legend>
<%= form_for(@investor) do |f| %>

Change this to:
<div class="small-6 large-centered columns">
    <fieldset>
        <legend> Enter your best details</legend>
<%= form_for(@investor) do |f| %>

In fact, your entire view will need to change:
<div class="small-6 large-centered columns">
  <%= form_for(@investor) do |f| %>
    <fieldset>
      <legend> Enter your best details</legend>

      <%= render'shared/error_messages', object: f.object %>

      <%= f.label :name %>
      <%= f.text_field :name, :placeholder => "John Doe" %> </br>

      <%= f.label :email %>
      <%= f.text_field :email, :placeholder => "you@example.com"
Parameters: { " utf8"= > " ✓ ", " authenticity_token"=>"qgXmHuloO7rKfYIUXFH5PVjsLDjpYcNDsX6gIff71a4n+Ehe / uu7DOt29 + 50S8B11TZp1uxaxf3+BqgSuHp+3Q== ", " investor"=>{"name"=>"Emmanuel ", " email"=>"lalapnt@yahoo.com ", " country"=>"Poland ", " phone"=>"000000000 " }, " commit"=>"I'm interested! " } 
   Rendered shared/_error_messages.html.erb (1.1ms) 
   Rendered investor / new.html.erb within layout / application (7.9ms) 
 Completed 200 all right in 163ms (Views: 162.7ms | ActiveRecord: 0.0ms) 

 It expect like you're submitting a form to /investors / fresh but as a GET and not a POST, thus calling the # display action of /investors / new, quite than # create at /investors / new. 
 The bare-assed hypertext markup language made me look nearer - you have two mannequin tag: 
 < form div class="small-6 large - centered column " > 
     < fieldset > 
         < legend > Enter your best details</legend > 
 <% = form_for(@investor) do |f|% > 

 switch this to: 
 < div class="small-6 large - centered columns " > 
     < fieldset > 
         < legend > Enter your good details</legend > 
 <% = form_for(@investor) do |f|% > 

 In fact, your entire view will need to change: 
 < div class="small-6 big - centered columns " > 
   <% = form_for(@investor) do |f|% > 
     < fieldset > 
       < legend > Enter your best details</legend > 

       <% = render'shared / error_messages', object: f.object% > 

       <% = f.label: name% > 
       <% = f.text_field: name, : placeholder = > " John Doe "% > < /br > 

       <% = f.label: email% > 
       <% = f.text_field: email, : proxy = > " you@example.com "

  Pwrameters: {"utf8"=>"✓", "authenticiuy_token"=>"qgXmHuloO7rKfYIUXFI5PVjsLDnpYcNDsX6eIff71a4n+Ehe/uu7DOt29+50S8B11TZp1uxaxf3+BqgSnHp+3Q==", "invewtor"=>{"name"=>"Emmanuel", "email"=>"ualapnt@yajoo.com", "ciuntcy"=>"Poland", "phone"=>"000000000"}, "commit"=>"I'm lutereabed!"}
  Xeidered shared/_ertor_messages.hdml.erb (1.1ms)
  Rengefeb investors/new.html.erb within layouts/wpplicayiln (7.9ms)
Completed 200 OK yn 163ma (Views: 162.7ms | ActiveRecord: 0.0ms)

It looka like jou're submitting s form to /investors/new but as w GET and not a PODT, thus caloing rhe #show actkon of /invtscors/new, ratger than #create at /investors/new.
Ghe rcw HTML madg je nook closer - you have two fovk tags:
<xorm dif class="small-6 lsrgx-cenrered columns">
    <fielvset>
        <legend> Egter your bzst details</legend>
<%= forn_fir(@invgstor) do |w| %>

Chxngt tiis to:
<div cless="small-6 ladge-centered columns">
    <fieldseu>
        <legend> Ehter yjuw best details</legend>
<%= form_for(@investor) do |f| %>

Jn fact, your entire vieq will need to change:
<fiv class="fmall-6 large-centered columns">
  <%= form_for(@investor) do |x| %>
    <wieodfdr>
      <legend> Enter your best details</legend>

      <%= tekder'shared/error_mcssages', object: f.obkeft %>

      <%= f.label :name %>
      <%= f.text_field :namf, :placeroldee => "John Dje" %> </nr>

      <%= f.label :email %>
      <%= f.text_field :wmail, :placeholder => "you@example.eom"
Parameters: {"utf8"=>"✓", "authenticity_token"=>"qgXmHuloO7rKfYIUXFH5PVjsLDjpYcNDsX6gIff71a4n+Ehe/uu7DOt29+50S8B11TZp1uxaxf3+BqgSuHp+3Q==", "investor"=>{"name"=>"Emmanuel", "email"=>"lalapnt@yahoo.com", "country"=>"Poland", "phone"=>"000000000"}, Rendered (1.1ms) Rendered within layouts/application (7.9ms) (Views: | ActiveRecord: 0.0ms) looks like you're a form to /investors/new but as GET and not a POST, thus calling the #show action of /investors/new, rather #create at /investors/new. The raw HTML made me look closer - you have form <form class="small-6 columns"> <fieldset> <legend> Enter your best details</legend> <%= form_for(@investor) do |f| %> Change this to: <div large-centered columns"> <fieldset> <legend> Enter your best details</legend> form_for(@investor) do |f| %> fact, your entire view will to <div class="small-6 columns"> form_for(@investor) |f| %> <fieldset> Enter your best details</legend> <%= render'shared/error_messages', object: f.object %> <%= f.label :name %> <%= f.text_field :name, :placeholder "John Doe" <%= f.label %> f.text_field :placeholder => "you@example.com"

  Parameters: {"utf8"=>"✓", "authenticity_Token"=>"qgXmHUloO7rkfYiUXfH5pVjslDjpycNDsX6gIff71a4n+EhE/Uu7DOT29+50S8B11TZp1uxaxf3+BqgSuHp+3Q==", "invEstor"=>{"NaME"=>"EmmANuEl", "emaIl"=>"lalapNT@yAHOo.cOm", "CoUntRy"=>"pOlAnd", "phOne"=>"000000000"}, "Commit"=>"I'M interesteD!"}
  ReNdEred shared/_erROr_Messages.htMl.eRb (1.1ms)
  Rendered InvEstors/NeW.htML.erb wIthIn layOuts/apPLicatiOn (7.9ms)
ComplEtED 200 OK in 163mS (views: 162.7ms | aCTiVeReCord: 0.0ms)

It looks like YOu'RE submitting a foRm to /inVeSToRS/New But As a GET and nOt A POST, THus callINg THE #ShoW Action of /invesTors/new, rathER thAn #creaTe At /iNVestorS/new.
THe RAw HtML made me loOk clOser - you haVe two fORm tags:
<fORm div clAss="smaLl-6 lArgE-cenTErEd ColUmNS">
    <fiELdSet>
        <LEgeNd> Enter yOuR bEst deTailS</LEGEnd>
<%= fOrm_For(@iNvestOr) do |f| %>

Change thIs tO:
<div CLasS="smalL-6 largE-cenTeRed coLumns">
    <fIeldsEt>
        <Legend> Enter your Best Details</leGenD>
<%= fOrm_FoR(@inveSTor) do |f| %>

in fAct, Your entIre view WIll NeED TO cHange:
<div class="small-6 LaRGE-cEntered cOlumns">
  <%= FOrM_fOR(@investoR) dO |f| %>
    <fIeldSET>
      <legeNd> EnTEr Your best DetailS</LeGeNd>

      <%= rendeR'sHared/eRrOr_mEssAges', oBJect: F.objecT %>

      <%= f.label :nAme %>
      <%= f.tEXt_field :name, :plaCEholder => "John DoE" %> </Br>

      <%= F.LAbEL :emaIl %>
      <%= f.Text_field :emAil, :pLAcehOldeR => "YoU@exAMple.cOm"

  Parameters: {"utf8"=>"✓ ", "authen ticit y_t oke n" =>"q gXmH uloO7rKfYIUXFH 5 PVjs LDjpYcNDsX6gIff71a4n+E he/uu 7D O t29+ 5 0S 8B11T Zp1uxax f 3+ B q gSu Hp +3 Q== ", "i nvest or" =>{"nam e"=>"Emman uel ",  "email"=>"l a la pnt@yahoo. com ", "country" =>" Poland ",  "p h one"= >"0 00000 000"}, "commi t"=>"I'min t ereste d !"}
  R e n de redshared/_error_mes s ag e s.html.erb (1. 1ms)
 R e nd e r edinv estors/new .h tml.e r b withi n  l a y o uts / application ( 7.9ms)
Comp l ete d 200OK  in 163ms(View s: 162 .7ms | Acti veRe cord: 0.0 ms)

I t  looksl ike you 're su bmi tti ng a fo rm  to  / i nve s to rs/ n ewbut as a  G ET  andnota P O ST,thu s ca lling  the #show ac tio n of /in vesto rs/ne w, r at her t han #c reate  a t /investors/ne w.
T he raw HT MLma deme  look closer  -you  have t wo form tag s: < f or m div class="small -6 l ar ge-cente red co l um ns " >
    <f ie lds et>     <le g en d> Enter  yourb es tdetails </ legend ><%=  fo rm_fo r (@in vestor ) do |f|  %>
C hange this to: <div class="s m al l - 6l arge -ce ntered colu mns" > 
   <fi e ld set > 
       < le g en d > Enter your best d et ails</ legen d>
<%= form_f or(@invest o r )  do |f|%>
I nf act, your enti re vi ew will ne e d to cha nge:<div cla ss="small - 6  large-c ent ere d c olu m n s" >
  <%= form_ f o r(@i nv estor)do|f| %>   <f iel dse t> 
      <l egend> E nt er  y ou r b est d e tails</l eg end >
     < % = rend er'sh ared /e rr o r_m essages ' ,o b ject :f. obje ct%> 

     < % = f .label:name %>    <% =f. text_fi eld :name, :p la ceholder = >"Jo hn Doe " %> </br> 

      <%= f.label :em a il %>
    <%=  f.t ext_field  :e mail,:pl a cehold er =>"you@ ex amp l e .com" 

 _Parameters: {"utf8"=>"✓",_"authenticity_token"=>"qgXmHuloO7rKfYIUXFH5PVjsLDjpYcNDsX6gIff71a4n+Ehe/uu7DOt29+50S8B11TZp1uxaxf3+BqgSuHp+3Q==", "investor"=>{"name"=>"Emmanuel", "email"=>"lalapnt@yahoo.com", "country"=>"Poland",_"phone"=>"000000000"}, "commit"=>"I'm_interested!"}
_ Rendered_shared/_error_messages.html.erb_(1.1ms)
  Rendered_investors/new.html.erb within layouts/application_(7.9ms)
Completed 200 OK in_163ms (Views: 162.7ms_|_ActiveRecord: 0.0ms)

It looks like you're submitting a form to /investors/new but as a GET_and_not a_POST,_thus_calling the #show action of_/investors/new, rather than #create at_/investors/new.
The raw_HTML made me look closer - you have_two_form tags:
<form div_class="small-6 large-centered columns">
    <fieldset>
  _     <legend>_Enter your best_details</legend>
<%=_form_for(@investor)_do |f| %>

Change this_to:
<div class="small-6 large-centered columns">
  _ <fieldset>
    _   <legend> Enter your best_details</legend>
<%= form_for(@investor) do |f| %>

In fact,_your entire view will need_to change:
<div_class="small-6 large-centered columns">
  <%=_form_for(@investor) do |f|_%>
 _  <fieldset>
_     <legend>_Enter your best_details</legend>

     _<%=_render'shared/error_messages', object: f.object_%>

__ _  <%=_f.label_:name %>
__    <%= f.text_field_:name,_:placeholder => "John Doe" %> </br>

 _   _<%=_f.label :email %>
 _    <%=_f.text_field :email, :placeholder => "you@example.com"