Get Queue Item bug? "System.ArrayTypeMismatchException"


I just tried the Get Queue Item and I’m getting the following error message:

System.ArrayTypeMismatchException: Attempted to access an element as a type incompatible with the array.

And it doesn’t work from UiPath.System.Activities version 19.2.0 and forward. This activity works perfect when I downgrade to package version 18.4.2.

Bug, or just me not understanding some new functionality?


What orchestrator version are you using?
How is get queue items configured?

Using Orchestrator 2018.3.2.

Configured it just by using an input and output:

The point is, is that I have two separate projects; one using UiPath.System.Activities v. 19.2.0 (or 19.3.0), and the other one 18.4.2, and I use the same queue as input. One fails, the other one works.



there is no difference in the activity between 18.4.2 and 19.2/19.3 so i think it may be orchestrator related. i will have to test it myself

you should output the activity into a variable of type

Double, triple, quadruple checked that it’s the right variable type.

i ve checked with 18.4.4 orch and its working fine with 19.2 and 19.3

its the same queue you are using as target? is there any special character or something in a queue item?

Same queue as target in both projects. No special characters unless “_” (underscore) is considered a special character, but I tried creating a queue with only alphabetic characters too. Did not work.

Can you try with Orchestrator 2018.3.2? That’s the Orch version I have.

Kind of leaning towards compatibility issues…?


i am facing exactly same issue, is it resolved?


Hi Varun, what Studio version do you have?

Same issue here, Orchestrator 2018.3.2 with Studio 2018.4.3 Package version 19.3.2

Hi all - this appears to be the same issue as we are tracking here:

Has anyone had a chance to check if it’s been fixed in their environment with UiPath.System.Activities v19.4 yet?

It has not resolved in UiPath.System.Activities v19.4 also

Same here :frowning:

[SOLVED] Just downgrade UiPath.system.Activities and UiPath.UIAutomation.Activities to 18.3.69!


I created the whole workflow and the problem persisted.

You solution worked like a charm!!! :slight_smile:


Thanks. It worked for me. I had to downgrade from 19.4

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