What is error: function definitions are not permitted in this context.?

This error message typically occurs when a function is defined in a context where it is not allowed, such as inside another function or inside a loop or conditional statement. In some programming languages, function definitions are only allowed at the top level of a file or script. This error can also occur if a function is not properly closed with a closing curly brace. To fix this error, the function definition must be moved to a valid context where it is allowed to be defined, or the syntax of the function must be checked to ensure it is properly closed with a closing curly brace.