[Bug]: pyRevit will not compile on starting Revit

[RiverRat205]

✈ Pre-Flight checks

• I don't have SentinelOne antivirus installed (see above for the solution)
• I have searched in the issues (open and closed) but couldn't find a similar issue
• I have searched in the pyRevit Forum for similar issues
• I already followed the installation troubleshooting guide thoroughly
• I am using the latest pyRevit Version

🐞 Describe the bug

pyRevit will not compile on Revit 2023 & 2024, (although it works just fine on Revit 2020)
Sentinel One is used but not the problem. We worked through that already.
I have tried all of the methods on the Installation issues page, with no luck.
I have also tried a handful of solutions from the forums.

A few weeks ago, after working through the S1 issues, I was able to get v4.8.14.24016 working by completely uninstalling and reinstalling it and several versions of Revit (mainly 2023 and 2024 as those are the ones we use for production.) I recently installed the latest version of pyRevit v4.8.15.24089, only to have it stop working on Revit 23 and 24. Every time I launch one of those versions, I get an error dialog that starts with IronPython Traceback:. This was the same problem I was having with the previous version.

⌨ Error/Debug Message

IronPython Traceback:
Traceback (most recent call last):
File "C:\Program Files\pyRevit-Master\bin\engines\pyRevitLoader.py", line 30, in <module>
File line 24, in <module>
File "C:\Program Files\pyRevit-Master\pyrevitlib\pyrevit\loader\sessioninfo.py", line 14, in <module>
File Files\pyRevit-Master\pyrevitIib\pyrevit\runtime\_init_.py", line 505, in < module>
Exception: Error dynamically compiling pyRevit runtime

Script Executor Traceback:
IronPython.Runtime.Exceptions.PythonException: Error dynamically compiling pyRevit runtime
at Microsoft.Scripting.lnterpreter.Throwlnstruction.Run(lnterpretedFrame frame)...

♻️ To Reproduce

No response

⏲️ Expected behavior

No response

🖥️ Hardware and Software Setup (please complete the following information)

==> Registered Clones (full git repos)
==> Registered Clones (deployed from archive/image)
master | Deploy: "basepublic" | Branch: "master" | Version: "4.8.15.24089+0912" | Path: "C:\Program Files\pyRevit-Master"
==> Attachments
master | Product: "Autodesk Revit 2025" | Engine: DEFAULT (2711) | Path: "C:\Program Files\pyRevit-Master" | AllUsers
master | Product: "24.2" | Engine: DEFAULT (2711) | Path: "C:\Program Files\pyRevit-Master" | AllUsers
master | Product: "23.1.3" | Engine: DEFAULT (2711) | Path: "C:\Program Files\pyRevit-Master" | AllUsers
master | Product: "2020.2.9" | Engine: DEFAULT (2711) | Path: "C:\Program Files\pyRevit-Master" | AllUsers
==> Installed Extensions
==> Default Extension Search Path
C:\Users\***\AppData\Roaming\pyRevit\Extensions
==> Extension Search Paths
==> Extension Sources - Default
https://github.com/eirannejad/pyRevit/raw/master/extensions/extensions.json
==> Extension Sources - Additional
==> Installed Revits
Autodesk Revit 2025 | Version: 25.0.2.419 | Build: 20240307_1300(x64) | Language: 1033 | Path: "C:\Program Files\Autodesk\Revit 2025\"
24.2 | Version: 24.2.0.63 | Build: 20231029_1515(x64) | Language: 1033 | Path: "C:\Program Files\Autodesk\Revit 2024\"
23.1.3 | Version: 23.1.30.97 | Build: 20230828_1515(x64) | Language: 1033 | Path: "C:\Program Files\Autodesk\Revit 2023\"
2020.2.9 | Version: 20.2.90.12 | Build: 20220517_1515(x64) | Language: 1033 | Path: "C:\Program Files\Autodesk\Revit 2020\"
==> Running Revit Instances
==> User Environment
Microsoft Windows 10 [Version 10.0.22631]
Executing User: ***
Active User:
Admin Access: Yes
%APPDATA%: "C:\Users\***\AppData\Roaming"
Latest Installed .Net Framework: 4.8
No .Net Target Packs are installed.
No .Ne-Core Target Packs are installed.
pyRevit CLI v4.8.15.24089+0912.f079f5fd51756b988a06d005d4f4cd2961f36e63

Additional context

No response

[jmcouffin]

/install-fix

[github-actions]

Hi @RiverRat205, Try these steps:

1. Uninstall pyRevit

2. Delete C:\ProgramData and %AppData%\ pyRevit and pyrevit-master folders

3. Move all Revit addins to a temporary location. Usual addins locations include:

   • %AppData%\Autodesk\Revit\Addins
   • %AppData%\Autodesk\ApplicationPlugins
   • %ProgramData%\Autodesk\Revit\Addins
   • %ProgramData%\Autodesk\ApplicationPlugins

4. [Reboot computer]

5. Reinstall pyRevit

6. Started each version of Revit confirming pyRevit successfully compiled at startup.

7. Move all Revit addins that were moved in step 3 back to their original location.
   You may want to add them one at a time and start a revit session everytime to figure out which ones are causing the issue.

[jmcouffin]

sorry for the canned answer, but it is almost always the solution and almost always an addin loading sequence incompatibility.

[RiverRat205]

I appreciate the quick response. I have tried that several times, including just a few minutes ago. I agree that a quick re-install will fix most issues.

[jmcouffin]

another possibility is to rename the pyrevit.addin file to something like 0_pyrevit.addin to load it

[RiverRat205]

That did the trick. Thank you so much.