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If you have a problem, CUT and PASTE your code. Do not retype or simplify it. Give a COMPLETE and COMPILABLE example of your problem. Otherwise we are all guessing the problem from a fabrication where relevant details are often missing.
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i reinstall qt sdk, but qt creator can't open ui file,
run designer and prompt runtime error
at last, I deleted C:\Users\King\.designer\gradients.xml
It's ok
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