Oracle Message PLS-00529 - Bad column name string in INSERT statement (must be an identifier)

ERRORBad column name string in INSERT statement (must be an identifier)
CAUSEIn an INSERT statement, an attempt was made to use a column name that is not an identifier. In any INSERT statement with explicit column list a column name must be a simple identifier.
ACTIONRewrite the INSERT statement, using a simple identifier for the column name.