[Bug]: Loading Dynamo Scripts not working - Personal Toolbar Issues

[kslifter]

✈ 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

I am having issues running the tools on my toolbar.

1. Dynamo Script - Error message
2. Dynamo Script - Error message
3. Website - Error message

Image for number 2

⌨ Error/Debug Message

1. 
IronPython Traceback:
Traceback (most recent call last):
 File "C:\Users\ihartsook\OneDrive - Hutton\Desktop\OFFICE STUFF\REVIT\Pyrevit\Pyrevit Toolbar\Hutton.extension\IansTools.tab\Code.Panel\Occupancy.stack\OccuRunAll.pushbutton\LS_Copy Occupant Load Factors_script.dyn", line 1, in <module>
NameError: name 'false' is not defined

Script Executor Traceback:
IronPython.Runtime.UnboundNameException: name 'false' is not defined
 at IronPython.Runtime.Operations.PythonOps.GetVariable(CodeContext context, String name, Boolean isGlobal, Boolean lightThrow)
 at IronPython.Compiler.LookupGlobalInstruction.Run(InterpretedFrame frame)
 at Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame)
 at Microsoft.Scripting.Interpreter.LightLambda.Run2[T0,T1,TRet](T0 arg0, T1 arg1)
 at IronPython.Compiler.PythonScriptCode.RunWorker(CodeContext ctx)
 at IronPython.Compiler.PythonScriptCode.Run(Scope scope)
 at IronPython.Compiler.RuntimeScriptCode.InvokeTarget(Scope scope)
 at Microsoft.Scripting.Hosting.CompiledCode.Execute(ScriptScope scope)
 at PyRevitLabs.PyRevit.Runtime.IronPythonEngine.Execute(ScriptRuntime& runtime)

2. (Image See above)

3. 
IronPython Traceback:
unexpected token ':' (line 1) 
invalid syntax (line 1) 
unexpected token ':' (line 2) 
unexpected token 'the' (line 2) 
unexpected token 'for' (line 2) 
invalid syntax (line 2) 
unexpected token ':' (line 3) 
unexpected token 'Hartsook' (line 3) 
unexpected token ':' (line 4)

♻️ To Reproduce

Click on the tool

⏲️ Expected behavior

Get Error message

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

C:\Users\ihartsook>pyrevit env
==> Registered Clones (full git repos)
==> Registered Clones (deployed from archive/image)
==> Attachments
Unknown | Product: "2026 First Customer Ship" | Manifest: "C:\ProgramData\Autodesk\Revit\Addins\2026\pyRevit.addin"
Unknown | Product: "2025 First Customer Ship" | Manifest: "C:\ProgramData\Autodesk\Revit\Addins\2025\pyRevit.addin"
Unknown | Product: "2024.3.4" | Manifest: "C:\ProgramData\Autodesk\Revit\Addins\2024\pyRevit.addin"
==> Installed Extensions
==> Default Extension Search Path
C:\Users\ihartsook\AppData\Roaming\pyRevit\Extensions
==> Extension Search Paths
==> Extension Sources - Default
https://github.com/pyrevitlabs/pyRevit/raw/master/extensions/extensions.json
==> Extension Sources - Additional
==> Installed Revits
2026 First Customer Ship | Version: 26.0.4.409 | Build: 20250227_1515(x64) | Language: 1033 | Path: "C:\Program Files\Autodesk\Revit 2026\"
2025 First Customer Ship | Version: 25.0.2.419 | Build: 20240307_1300(x64) | Language: 1033 | Path: "C:\Program Files\Autodesk\Revit 2025\"
2024.3.4 | Version: 24.3.40.26 | Build: 20250918_1515(x64) | Language: 1033 | Path: "C:\Program Files\Autodesk\Revit 2024\"
==> Running Revit Instances
Error: Object reference not set to an instance of an object.
Run with "--debug" option to see debug messages

Additional context

No response

[tay0thman]

I have a feeling this is related to the C# Loader reading Dynamo Scripts, I'll test it out myself and confirm this issue.

[jmcouffin]

utf-8 encoding missing somewhere? @romangolev not sure if this is for you?

[romangolev]

@jmcouffin It looked like a similar problem with the loader we had before, at the first glance. But could really be a dynamo issue here

[kslifter]

I know you guys are busy, but wanted to check in to see how things were coming along on this. Thanks

[tay0thman]

@kslifter I tested the latest commits from @romangolev , which mainly focus on loader issues in Python and UI concerns. However, the problem with loading Dynamo scripts still isn’t resolved, so I’ll keep this issue open until it’s fully fixed. The good news is that the major hot ticket items are ready to ship, allowing us to focus on other tasks like this one.

[tay0thman]

@kslifter for error #3 Website, can you be more descriptive in the error you are getting? are you referring to .urlbutton?

[kslifter]

@kslifter for error #3 Website, can you be more descriptive in the error you are getting? are you referring to .urlbutton?

I tried it again and go this error:

IronPython Traceback:
unexpected token ':' (line 1)
invalid syntax (line 1)
unexpected token ':' (line 2)
unexpected token 'the' (line 2)
unexpected token 'for' (line 2)
invalid syntax (line 2)
unexpected token ':' (line 3)
unexpected token 'Hartsook' (line 3)
unexpected token ':' (line 4)

[tay0thman]

@kslifter so it is not a urlbutton, is there something in your script that you can check? can you send me the first 3 lines of it?

[jmcouffin]

Cannot repro with latest WIP installer,
url buttons are fixed in latest WIP.

If you can repro with the latest wip, please provide the script to be tested against, Hard for us to repro without your specific context

I used the new dynamo script sample to test if out extensions\pyRevitDevTools.extension\pyRevitDev.tab\Debug.panel\Bundle Tests.pulldown\Test DynamoBIM GUI.pushbutton\script.dyn in the devtools extension

[kslifter]

g i

I installed the latest version this morning and still getting a popup.

From this screenshot you can see my .yaml file and how I have the folders setup.

I also tried using a couple of dynamo script buttons and this popped up:

Lastly, when I look at the 'About' info it still says PyRevit v6.0.0.0. I've confirmed I have installed the correct version, was updating this missed?

[tay0thman]

@kslifter can you add language identifier here, like the below:

for the Dynamo, @romangolev can you look at declaring encoding on the file DynamoBIMEngine.cs I think the error can happen in case a Non-ASCII characters were found, likely inside a python node or a package within your dynamo script.

[kslifter]

@kslifter can you add language identifier here, like the below:

for the Dynamo, [@romangolev](https://github.com/romangolev) can you look at declaring encoding on the file **DynamoBIMEngine.cs** I think the error can happen in case a Non-ASCII characters were found, likely inside a python node or a package within your dynamo script.