creating tcode for method in local class , hot to get the parameters option

hello everybody,

I created a transaction code for a instance method which i used in my local class ,

but if that method contains exporting and importing parameters , the program is leading to short dump.

and getting an run time error "CALL_METHOD_PARMS_ILLEGAL".{not catchable}

how can make my end user to give some input parameters before the output.

before the output i want the selection screen enable for the user for that method only?

please let me know in detail.

thank you all.