Output argument Tf is not assigned on some excution paths

Sir, I have matlab embedded function block inside simulink with 2 Dimensional variable 'Tf'. Actually it is 10 by 5 matrix. This variable is calculated in "if" as well as "else" statement with different expressions.

I am getting error message : Output argument Tf is not assigned on some excution paths

What can be reason of error ?

Previously I had output variable outputing a single number and program was running successfully, but now I am getting error message.

Awaiting for your reply