# Issue with Export to HTML using variable-defined condition file in loop: NameError, UnboundLocalError
**URL:** \
**Category:** Online experiments\
**Tags:** pavlovia\
**Created:** [July 22, 2021, 6:20pm UTC](https://discourse.psychopy.org/t/issue-with-export-to-html-using-variable-defined-condition-file-in-loop-nameerror-unboundlocalerror/24180 "2021-07-22T18:20:02Z")\
**Posts on this page:** 1\
**Showing post:** 6
**Author:**  [@JensBoelte](https://discourse.psychopy.org/u/JensBoelte)\
**Post date:** [July 28, 2021, 5:38am UTC](https://discourse.psychopy.org/t/issue-with-export-to-html-using-variable-defined-condition-file-in-loop-nameerror-unboundlocalerror/24180/6 "2021-07-28T05:38:59Z")
Hello,
I remember a commentary that underscores can create problems
> [@Pavlovia error: 'Maximum call stack size exceeded'](https://discourse.psychopy.org/t/pavlovia-error-maximum-call-stack-size-exceeded/20746):
>
> Description of the problem: Error half way through experiment before text-based trials. Hello! When piloting my experiment on Pavlovia it returns the error message: RangeError: Maximum call stack size exceeded The first part of the experiment is a series of images which runs fine, however the error occurs once it reaches a point where a series of words are supposed to be presented. The experiment works with no issues on psychopy. This is the first experiment I’ve programmed and very new to t…
although with a different error message.
Best wishes Jens
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_[View the full topic](https://discourse.psychopy.org/t/issue-with-export-to-html-using-variable-defined-condition-file-in-loop-nameerror-unboundlocalerror/24180)._