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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 high-level directive such as .IF, .REPEAT, or .WHILE.

  • 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.

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