# Issue when invoking python script

**URL:** <https://forum.uipath.com/t/issue-when-invoking-python-script/494755>\
**Category:** Studio\
**Tags:** systemexception, data, python, activities\
**Created:** [29. November 2022 um 11:32 UTC](https://forum.uipath.com/t/issue-when-invoking-python-script/494755 "2022-11-29T11:32:07Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![b.forbes](https://sea2.discourse-cdn.com/uipath/user_avatar/forum.uipath.com/b.forbes/32/267780_2.png) [@b.forbes](https://forum.uipath.com/u/b.forbes)\
**Post date:** [29. November 2022 um 11:32 UTC](https://forum.uipath.com/t/issue-when-invoking-python-script/494755/1 "2022-11-29T11:32:07Z")

</div>

I am trying to run a python script on a series of documents to generate new reports.

The script is working, but it is throwing this error in UiPath, causing the bot to fail -

 ![image](https://global.discourse-cdn.com/uipath/original/4X/7/9/f/79f90b08c298e5a5abbcdbe0abd82ebef7e70074.png)

There are no arguments or variables called “stream” in my workflow, or in the python script, so I’m not sure what the process is failing to assign.

Properties of scope:

 ![image](https://global.discourse-cdn.com/uipath/original/4X/c/0/d/c0d850e378bdf78f1e795082b07a4aa93c8daa8b.png)

Properties of invoke script:

 ![image](https://global.discourse-cdn.com/uipath/original/4X/4/8/8/4880ce9a9f1292bd2c5b3a6c223df666d7f9d07f.png)

Any help much appreciated.

---

<div class="post-metadata">

**Author:** ![system](https://sea2.discourse-cdn.com/uipath/user_avatar/forum.uipath.com/system/32/182466_2.png) [@system](https://forum.uipath.com/u/system)\
**Post date:** [1. Dezember 2022 um 16:00 UTC](https://forum.uipath.com/t/issue-when-invoking-python-script/494755/2 "2022-12-01T16:00:52Z")

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Hello @b.forbes!

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