Assertion Failed - Quit,retry=debug, ignor= continue

i was workin on my peach tree then suddenly this blue and white message with big red x mark appeared. when i hit retry it froze. when i tried to continue it said it maybe unstable.

 can anyone pls tell me what this is about if anyone had encounted this type of problem? unfortunately i need my peachtree to finish my work. can anyone please help? appreciate your help. thanks

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