JIT compilation is disabled for non-Legacy projects. Uipath Studio

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1

Hi,
I am trying to run a studio project .json which I have modified but I get the following errors while trying to invoke the Main_Process workflow in which I have the whole process flow.

The image shows an error log where JIT compilation for non-Legacy projects failed in the Main_Process of a workflow, highlighting a problem with parsing and comparing the day of the week in a specified code expression. (Captioned by AI)
The image shows an error log where JIT compilation for non-Legacy projects failed in the Main_Process of a workflow, highlighting a problem with parsing and comparing the day of the week in a specified code expression. (Captioned by AI)1584×299 193 KB

I 've got the UiPath Studio version 2025.0.157

Moreover, if I try to open a different project I get the following popup:

A software dialog box is prompting to convert a legacy project to a Windows-supported project, with options to create a new project, convert, or cancel. (Captioned by AI)
A software dialog box is prompting to convert a legacy project to a Windows-supported project, with options to create a new project, convert, or cancel. (Captioned by AI)615×256 36.9 KB

I’ve been looking for some solutions to this issue and I’ve found that it is an issue of the latest versions of the UiPath Studio that it does not support the Windows-Legacy projects anymore.
For this reason, if you open an existing Windows Legacy project it only gives the option to convert the project to Windows projects, just like the popup mentioned.

Some people have been able to solve their error by updating all packages to the latest version but I still get the error “JIT compilation is disabled for non-Legacy projects.” when I try to run the workflow.
All the packages have been updated:

The image shows the "Manage Packages" window in UiPath Studio, displaying various packages such as UiPath.UIAutomation.Activities, UiPath.Mail.Activities, and Microsoft 365, along with their versions and statuses. (Captioned by AI)
The image shows the "Manage Packages" window in UiPath Studio, displaying various packages such as UiPath.UIAutomation.Activities, UiPath.Mail.Activities, and Microsoft 365, along with their versions and statuses. (Captioned by AI)1465×909 319 KB

I have a lot of RPA’s so changing the workflow or copy-pasting the flow to the Windows Project would be my latest option since there are many RPA’s and it would be too much work.
Is there any simple solution that I could apply to the UiPath Studio without the need to apply modifications to the RPAs individually?

Thankyou very much :slight_smile:

Nona

2

I have tried to convert to Windows a different workflow by creating a new project.

A dialog box from UiPath prompts the user to convert their legacy project to a Windows project, with options to create a new project, convert, or cancel. (Captioned by AI)
A dialog box from UiPath prompts the user to convert their legacy project to a Windows project, with options to create a new project, convert, or cancel. (Captioned by AI)615×256 36.9 KB

When I try to run the workflow I am getting this error:

The image shows an error message in the Output pane indicating that Just-In-Time (JIT) compilation is disabled for non-Legacy projects, resulting in exceptions during the execution of a workflow file in a software application. (Captioned by AI)
The image shows an error message in the Output pane indicating that Just-In-Time (JIT) compilation is disabled for non-Legacy projects, resulting in exceptions during the execution of a workflow file in a software application. (Captioned by AI)1611×415 191 KB

I don’t know how can I get over this error :frowning: Could someone help me please?
Thanks!

3

@nona ,

This link old uiapth studio version. Befero uninstal current uiapth studio after intstal that: :slight_smile:

https://www.mediafire.com/file/ieife2b50ltnb2q/Uipath_Setup.zip/file

4

@nona,

Follow this approach

  1. Close the project from Studio
  2. Open Project.json file of your project in notepad or any available text editor
  3. Update UiPath.System.Activities version to latest possible version

The image shows a snippet of a JSON file with details of a UiPath project, highlighting the "UiPath.System.Activities" dependency version "24.10.6". (Captioned by AI)
The image shows a snippet of a JSON file with details of a UiPath project, highlighting the "UiPath.System.Activities" dependency version "24.10.6". (Captioned by AI)764×435 41.3 KB

  1. Save the project.json file and close.
  2. Open the project with Studio and try to convert it to Windows compatibility.
5

Hi @ashokkarale,
I’ve tried to follow your solution.
I’ve changed the UiPath.System.Activities version to 24.10.6 as seen in your image in the notepad.

The image is a screenshot of a JSON file opened in Notepad, detailing the configuration settings and dependencies for a project named "NightAuditMonitoringFramework." (Captioned by AI)
The image is a screenshot of a JSON file opened in Notepad, detailing the configuration settings and dependencies for a project named "NightAuditMonitoringFramework." (Captioned by AI)1522×862 191 KB

I’ve saved the Notepad.
But when I convert the project to Windows compatibility I still get this errors:

The image shows a list of file import errors and code syntax errors in a development environment, with specific issues related to missing imports and type inference problems in a .xaml file. (Captioned by AI)
The image shows a list of file import errors and code syntax errors in a development environment, with specific issues related to missing imports and type inference problems in a .xaml file. (Captioned by AI)1354×325 117 KB

It’s like the flow invoked called Main_Process keeps getting errors.

When I try to run the flow I get the same errors:

The image shows a software development environment with an 'Error List' panel displaying two validation error messages related to type inference and an expected closing parenthesis in a file named "Main_Process.xaml". (Captioned by AI)
The image shows a software development environment with an 'Error List' panel displaying two validation error messages related to type inference and an expected closing parenthesis in a file named "Main_Process.xaml". (Captioned by AI)1722×391 106 KB

Do you have any other recomendations?

Thank you for your time :slight_smile:

6

@nona ,

Can you please share a legacy project that has this issue with me via DM?

Thank you

7

Hi @nona

This might be a wild guess, but I noticed different double quotations in the error message above:

The image shows an error message indicating that compilation is disabled for non-Legacy projects, with a specific exception related to date parsing and string comparison using the .NET framework. (Captioned by AI)
The image shows an error message indicating that compilation is disabled for non-Legacy projects, with a specific exception related to date parsing and string comparison using the .NET framework. (Captioned by AI)1402×122 95.5 KB

Could you give it a test by:

  • first replacing all quotations in your legacy project to this one "
  • trying to convert the project again
8

I encountered the same problem as you. I still reported an error after trying to upgrade <UiPath.System.Activities>. Later, I found that I was dealing with the error of excel, so I upgraded the corresponding excel activity package: <UiPath.Excel.Activities>, and then ran it again without any problem. So my understanding is: which activity package reports an error, which activity package can be upgraded

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