Hi, @Hara_Gopal
Nice too me you, the frist step is create a assing activities,
Now, Do you need create into a variable in the first field
Usually, the set var is GenericType default,
Now do you need select the correct type in the sidebar panel
Im using generic type in this moment, and i will need string type 
so for this changes, now,
in the second field select the new type!
VUALA!
IS TO sTRING!!
REGARD
CYA
Yoichi
Raja.G
mkt.scott4