# [Lisrel] When including a control variable the solution doesnt converge

#### Kaja_Ra

##### New Member
Hello,

Im testing for the mediating effect and Lisrel works fine when only independent and dependent variables are included. The problem occurs when I include a control variable (TT) in SEM. I encounter the following warning:

W_A_R_N_I_N_G: The solution has not converged after 820 iterations.
The following solution is preliminary and is provided only
for the purpose of tracing the source of the problem.
Setting IT>820 may solve the problem.

I have already tried to set IT = 5000, but it does not help.

Attached is the syntax I used.

I would really appreciate any help.

Thank you,
Kaja