Error : An error occurred, please contact your system administrator

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Hello everyone, Can anybody plz help me to get ride of this error, I downloaded a calendar in my schedule when i try to open my schedule it give me this error “An error occurred, please contact your system administrator” :(
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1 answers
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I think you have added some custom logic where you are adding operation on nullable field. Please check that you have properly added nullable check in your logic.

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