I keep getting this error on Orchestrator but not while running manually

[rodrigo.simao]

Hello, I keep getting this error on Orchestrator when trying to run an automation:

Could not load type ‘System.Activities.TextExpressionBase`1’ from assembly ‘UiPath.Workflow, Version=6.0.0.0, Culture=neutral, PublicKeyToken=null’.

I already updated the version of the system.activities and of Ui.Automation directly on the process.
This doesn’t let the process run at any circumstances has anyone ever faced this issue?

[ashokkarale]

@rodrigo.simao,

It happens mostly due to incompatibility between Studio version and Robot version differences.

Check these few threads for more understanding and solution.

Could not load type 'System.Activities.TextExpressionBase`1' from assembly 'UiPath.Workflow, Version=6.0.0.0, Culture=neutral, PublicKeyToken=null'

If you are using any package which is higher than any available in Enterprise version then it won’t work. Don’t use beta versions in Enterprise versions. If you lower the versions available to match with Enterprise and publish, it will work. Uninstall community version studio and install Enterprise dev studio and link with that Enterprise cloud orchestrator to resolve the issue. Enterprise studio is 2023.4.4.

Could not load type 'System.Activities.TextExpressionBase`1' from.....Error running unattended robots from orchestrator

From what I have tested, anything published from studio 23.10 breaks on 22.10 robot, even if packages should be compatible. My colleague published the exact same project from a 23.4 studio and that did work on the 22.10 robot.

Thanks,
Ashok

[rodrigo.simao]

Can I use the latest version of studio?

[postwick (Paul Ostwick)]

The version of Studio you use should match the version of Orchestrator you’re using.

[ashokkarale]

@rodrigo.simao,

Yes, you can use If your Orchestrator version and Robot version supports it. Check this compatibility matrix.

Overview - Compatibility matrix

Thanks,
Ashok

[rodrigo.simao]

Orchestrator version:

Robot and Assistant version:

What studio version should I install?

[postwick (Paul Ostwick)]

Since you’re on 23.10.x of Orchestrator you should use 23.10.x of Studio.

[rodrigo.simao]

is 23.10.8 good enough? I had the 23.10.3 studio version and it was causing these problems

[postwick (Paul Ostwick)]

That error isn’t coming from Orchestrator. It’s coming from Robot that’s installed on the robot server. Check THAT version.

[rodrigo.simao]

This is what I have on the server side:

[rodrigo.simao]

And the robot has the same version:

The thing that is bothering me is that before today everything ran wihtout any problems

[postwick (Paul Ostwick)]

That’s likely your issue. You’re building the automation in a newer version of Studio then trying to run it on an old version of Robot. Upgrade those servers. Just so you know you don’t need Studio installed on robot servers. You can install just Robot.

[postwick (Paul Ostwick)]

@rodrigo.simao

The thing that is bothering me is that before today everything ran wihtout any problems

@rodrigo.simao

I already updated the version of the system.activities and of Ui.Automation

This could be the issue, also. You’re using later versions of packages and trying to run them on 2022.x Robot. Pay attention to the descriptive text shown for packages in the Manage Packages window - it tells you the minimum version necessary for Studio/Robot to run that package.