When a Z quote rule is being run the following error occurs : apex.bytecodeinterpreter.interpreterRuntimeException: Unable to resolve method reference: java/lang/String.(char[], boolean)void
Kindly check the Rules created if it has been framed to match the right field types else this error occurs.
For example please check the below Rule where this error had occurred: 
In Attribute 4
Term field [Picklist Field Type ] is updated by Initial Term field [Number Field type ] thus there is a mismatch between the datatypes.
Thus it resulted in the error apex.bytecodeinterpreter.interpreterRuntimeException: Unable to resolve method reference: java/lang/String.(char[], boolean)void
On removing the Attribute 4 and the Rule Engine Fired successfully else kindly assign the right field type for the Rule Engine to execute successfully
