Error:invalid Storage class for function

Error:invalid Storage class for function

A problem was encountered at compile time today: Error prompt invalid storage class for function "XXXXX"
It was later found that there was no match for "{" "}".
Because you usually pay attention to the "{" "}" problem, each use will be used in pairs. After careful examination, it was found
"#ifdef" "#endif" to block one of the "}".
Be careful later on "#ifdef" #endif "and so on:" #if "" #else "" #endif "" ifndef "and so on and other statements.
PS: Compiler error errors are grammatical errors, usually develop good code habits is very important

Error:invalid Storage class for function