Microsoft.Activities.Expressions.IsTrue is gone after upgrade to newest version of UiPath

Hello, I just upgraded UiPath to the newest version and my workflow is no longer working because of an IsTrue activity which cannot be loaded. I have installed all available packages, but it is still not there. The error I get in the workflow is this:

Activity could not be loaded because of errors in the XAML.

And in the output I see the following error message:

Could not find type ‘IsFalse’ in namespace ‘’.

How can I resolve this? Has this activity been removed or is there a package that I for some reason do not have access to?



The activity Is true is included like you mentioned in Microsoft.Activities.Extended. Can you try to reinstall the the package?


Hi, I tried uninstalling and reinstalling the Microsoft.Activities.Extensions now, but it did not work. I no longer have access to the Microsoft.Activities**.Expressions**, only the .Extensions. I cannot find a package called Microsoft.Activities.Expressions. I also no longer have the Microsoft.Activities

I.e. I am left with only .Extensions.

Hi tea, did you found a solution for this already? I had the same issue but after I installed package “Workflow Manager activites” all the ones you listed became available.


Hi, it actually began working again by itself just as suddenly as it had stopped working, but today the error is back again. I had not done anything in my workflow since last time I published it, and when I opened it, the error message was there again. I will try uninstalling and reinstalling that package you mentioned.
Edit: Yes, that package solved it, thank you matsi!

Go to Manage Packages, Install Workflow manager activities. This will resolve the problem. you can find all the activities Microsoft->Activities->Expressions


Hi, I am seeing this issue, I cannot see Microsoft->Activities->Expressions.
I have tried re-installing the packages to no avail.
Please can you advise?


1 Like

Hi All,

Iam not able to see the workflow manager activities in the package manager console. Where can I find it?
Could anyone please help

Try Ctrl+P -> Available -> search on microsoft. At least that’s where I find it…

You are right, Microsoft.Activities.Expressions is no longer available. Just go to Manage packages, choose All packages and type in search “Workflow Manager Activities”, install this. It is exactly what you want.


Thank you. This is what I was looking for.

Why did uipath remove IsTrue activity after upgrade? Does uipath have an alternate activity for this?

Please install Microsoft.Activities.Extensions it is working for me

In UIPath 19.9+ ,You can download the package named “Workflow Manager Activities” to use Is True Activity.

Go to “Manage Packages” --> “Settings” --> select “Official” check box.
Now go to “All Packages” and search for “Workflow Manager Activities”.
You should get the package. If you are still not able to get the package click on “Official” which is under “All Packages”, the package should be available for you to install now.
PFA screenshot for reference.

1 Like

Hi Yashaswini,

Try pasting this line in json: “Microsoft.Activities”: “[1.0.1]”,


The source URL has changed as a result this activity is not getting picked up. Please add a custom source, as shown below. And then you should get the “Workflow Manager Activities”

Install Workflow Manager Activities…you will get Split Activity


Just use the ‘Check True’ activity which does the same.

Senthil V.