This issue can be fixed by opening the TestStand Version Selector and making the desired version active. This error message is the result of attempting to open a version of TestStand that is not the currently active version. The error message indicates which version is currently active and which version you are trying to open. In this case, we are trying to open TestStand 17.0.0 while Teststand 4.2.1 is active.
For more information about what happens when a specific TestStand version is made active, please see TestStand Version Selector.
With the release of TestStand 3.1, the TestStand Version Selector was introduced to facilitate having multiple versions of TestStand installed on a computer. See TestStand 3.1 Release Notes for more information.
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