error in formula

This code is written in a formula
If I remove the 2nd assignment statement(j:=j+27 from the else part
then it is accepted. But if the 2nd statement is there it gives error.
Any solution.


EvaluateAfter ({@issuer_test});
numberVar LengthIssuer1 ;
global stringvar issuer1_for_test;
global stringVar array issuer1_part:=['a','b','c','d','e'];
numbervar i:=1;
numbervar j:=1;
numbervar k:=1;
numbervar l:=0;
numbervar m:=0;
LengthIssuer1:=Length (issuer1_for_test);

If LengthIssuer1 <=26 then
(
issuer1_part[1]:=issuer1_for_test;
)
else
(
if mid({@issuer_test},j+26,1)=' ' then
(
issuer1_part:=mid({@issuer_test},j,26);
j:= j+ 27;
)
)