ML Fatal Error A1010
unmatched block nesting :
A block beginning did not have a matching end, or a block end did not have a matching beginning. One of the following may be involved:
A conditional-assembly directive such as IF, REPEAT, or WHILE.
A structure or union definition.
A procedure definition.
A segment definition.
A POPCONTEXT directive.
A conditional-assembly directive, such as an ELSE, ELSEIF, or ENDIF without a matching IF.