What does the error message "expected primary-expression" indicate when compiling Cuda?

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The error message "expected primary-expression" usually indicates a syntax error in the code. It means that the compiler expected to find a valid expression but instead found something else. This could be caused by a missing or extra parenthesis, a misspelled word, or a misplaced operator. It is often helpful to look at the line of code where the error occurred and check if there are any obvious mistakes.