What is the meaning of the error code "struct Student variable has an incomplete type"?

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The error code "struct Student variable has an incomplete type" means that there is an issue with the definition or declaration of a struct called "Student". This error occurs when the compiler encounters a line of code that attempts to create a variable of type "Student", but it has not yet seen the full definition of the struct. This can happen if the struct definition is missing or is not properly included in the current source file.