whenever I try to click on my app any button this messasage show The operation + cannot accept the arguments: , [empty-string], [1]

whenever I try to click on my app any button this messasage show

The operation + cannot accept the arguments: , [ empty-string ], [1]

Welcome,

Please don’t make your title the same as your post. Read this and then give more info. First step always search the community before asking any question.

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Elaborate more and show your blocks

Show your block section or the part of your block section where your adding any two or more values