Unmatched Background Error - can't read "myoptsfields": no such variable

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Describe the bug Get the following when saving MySQL Transaction Counter options in the GUI

Unmatched Background Error - can't read "myoptsfields": no such variable
           while executing
       "subst $myoptsfields "
           invoked from within
       ".countopt.b1 invoke "
           invoked from within
       ".countopt.b1 instate !disabled { .countopt.b1 invoke } "
           invoked from within
       ".countopt.b1 instate pressed { .countopt.b1 state !pressed; .countopt.b1 instate !disabled { .countopt.b1 invoke } } "
           (command bound to event)
       Unmatched Background Error - can't unset "myoptsfields": no such variable
           while executing
       "unset myoptsfields"
           invoked from within
       ".countopt.b2 invoke "
           invoked from within
       ".countopt.b2 instate !disabled { .countopt.b2 invoke } "
           invoked from within
       ".countopt.b2 instate pressed { .countopt.b2 state !pressed; .countopt.b2 instate !disabled { .countopt.b2 invoke } } "
           (command bound to event)

To Reproduce Use the GUI and set MySQL transaction counter options

Expected behavior Should not error when saving

Additional context Found bug when updating PR https://github.com/TPC-Council/HammerDB/pull/670 so change has been included in this PR

Workaround Set desired parameters in the MySQL build or driver options (they set the same variables) and then start transaction counter running and it will use these variables.

TPC-Council / HammerDB

Unmatched Background Error - can't read "myoptsfields": no such variable #673