Uninitialized string offset: 36

Applications PROD environment
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#1

Uninitialized string offset: 36

how to find this error and what could be wrong.
I am so confuse and did not find this, its happen after run-button process.

any good suggestion to solve this issue.

thanks in advance.

#2

a array bad.

#3

array overflow.

#4

Go to application and set all debug options to on. Then regenerate this error and hope that a filename and linenumber is shown. Then look into the generated code what caused the problem: code entered by yourself of generated code. Then start from there. This is too less info to go on to.