[rules-users] "then" syntax not executing

[vanitha]

hi
the rule given below is compiling without error but 'then' syntax is not
getting executed. when i tried to debug the rule executor class, the
workingMemory.fireAllRules() is executed but when i tried to print the error
message after firing, it is returning a null.

DSL rule:
[when]if {value1} is present in the list=exists List1(vlist1=={value1})
[then]set the error message as {value3}=err.setErrormessage({value3});

please help me out in this regard
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