I am sorry to hear you are experiencing this problem. Please check whether this path 'C:\Program Files (x86)\Telerik\Test Studio Projects\MPL_Project\..\PL 0001A 0909'
is correct. (i.e. does it actually lead to the intended test?).
Also, please check whether the relative path you are using in the coded step is correct. If your folder structure is like this:
You can run the subtest using the following code:
If you continue to have dificulty, please go ahead and send us a copy of your test project(in a .zip file), so that we can analyze it and try to determine what is causing the issue.
the Telerik team
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