Unmatched single quote (')

Synopsis
This is an error in the way the REXX script is written.

Cause
There is the opening quote mark ' without the closing quote mark.

Cure
Count the opening and closing quotes and make sure that there are the same number of each. If you're using a single quote inside of a string, for example, to make the contraction can't, then make sure that you use double quotes around the whole string, for example:

"Here's a REXX Literal String."
Or use duplicate quote characters, back to back, where you want one quote character, for example:
'Here''s a REXX Literal String.'