Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.

pls resolve the problem

Answer 1

[Image Analyst]

You didn't attach any code so there is not much we can suggest.

Here is how to resolve the problem:

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Answer 2

[Walter Roberson]

Go through your expression character by character, counting brackets. Each time you have a ( character increase the count by 1. Each time you have a ) character decrease the count by 1.

If there is any point at which the count goes negative then you have too many ) compared to your ( . You might have ) you do not need or you might be missing a (

At the end of the expression the count should be 0. If the count is positive then you have too many ( compared to ) . You might have a ( you do not need or you might be missing a )