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Create DLL from VI and call in TestStand

Hello,
i´m using LabView 8.21 and Teststand 3.5. Currentlly i´m playing with the project-Explorer where i´m creating DLLs.
The first and easiest step was to create a new VI with string-in and strig-out.
Then i added this vi to my project and created a DLL from it.
This DLL is called in TestStand where the parameters are automatically detected.

But when i add an boolean-input and boolean-output und do exactly the same then Teststand says:
 "This function either does not have parameter-information in the DLL or uses types not recognised by teststand."

The type of the boolean is "LVBOOLEAN" in the created header-file.

What am i doing wrong? Why is this simple bool-value not working? I bool works not then i can never use the Labview-error-out-cluster inside a DLL?
Or is there an easy trick to solve this?

Thanks for your help
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