Operation not valid with the current stack size According to bip65
https://github.com/bitcoin/bips/blob/master/bip-0065.mediawiki

I can use expressions like IF ... ELSE ... ENDIF
Here is example script from this document:

IF
    HASH160 &lt;Hash160(encryption key)&gt; EQUALVERIFY
    &lt;publisher pubkey&gt; CHECKSIG
ELSE
    &lt;expiry time&gt; CHECKLOCKTIMEVERIFY DROP
    &lt;buyer pubkey&gt; CHECKSIG
ENDIF


But when I trying to spend transaction with the following script:

OP_IF 
    OP_SHA256 4bf5122f344554c53bde2ebb8cd2b7e3d1600ad631c385a5d7cce23c7785459a OP_EQUAL 
OP_ELSE 
    10 OP_CHECKLOCKTIMEVERIFY OP_DROP OP_SHA256 dbc1b4c900ffe48d575b5da5c638040125f65db0fe3e24494b76ea986457d986 OP_EQUAL
OP_ENDIF


https://tchain.btc.com/dbf477b700b7e159c07f15e1b6f5917e1247175e055fe533068a6fbc4ce2c374

I get error:

bitcoin-cli -testnet sendrawtransaction 020000000174c3e24cbc6f8a0633e55f055e1747127e91f5b6e1157fc059e1b700b777f4db000000000151ffffffff01c0d401000000000023a820dbc1b4c900ffe48d575b5da5c638040125f65db0fe3e24494b76ea986457d9868700000000
error code: -26
error message:
mandatory-script-verify-flag-failed (Operation not valid with the current stack size) (code 16)


Where is my error ? 

P.S. 


  SHA256 from 1 ->
  4bf5122f344554c53bde2ebb8cd2b7e3d1600ad631c385a5d7cce23c7785459a
  
  SHA256 from 2 ->
  dbc1b4c900ffe48d575b5da5c638040125f65db0fe3e24494b76ea986457d986
Your transaction only has 0x51 (just OP_1) in its scriptsig,  the OP_IF consumes the 1, and OP_SHA256 then operates on an empty stack, causing this error.