Solution : https://service.sap.com/sap/support/notes/1590328 (SAP Service marketplace login required)
Key words : 
runtime error          convt_no_number  abap program           sapfswt1 reason, byte sequence big endian, incorrect byte sequence, byte sequence, workflow trace, file system, application server, solution identify, current system, correction instructions
Related Notes : 
       
| 1310720 | Collection Note for Unicode Systems with different endianess |