Are you saying that you are using ASTAP with the INDI Simulator CCD driver, that there are stars in the image, and that you try to plate solve and it doesn't solve?  Based on what you said, I assume you had ASTAP installed and working well with a previous KStars version with StellarSolver, so that is not the issue?

Is it pointing near the pole?  Could you try a different area of the sky?  maybe select an area with different or more stars?

I just tried plate solving with ASTAP with simulators on the latest Beta and it solved right away

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