A string continuation character ('_') is not followed by another string.
#3021 Compile-time error
A string continuation character ('_') is not followed by another string.
Additional Information
Reached the end of the current file while continuing the
string "X...".
or
Found character 'X' while continuing the string "Y...".
Explanation
Every string continuation character ('_') must be found between two
strings, and the entire sequence of continued strings must be contained
completely within one file.