Simulink is giving error in the case I use If statement in simulink matlab function block.

Hello,

I have to use 3 different if statements in Matlab Function block in Simulink. When I run the simulation, it gives an error and refuse to run data of 'double' type in Matlab Function block. I tried to find the required data type for this case but, unfortunately, I coudn't find the answer. So I tried to change data type randomly using 'convert' block. This couldn't solve the problem. May you help me?

Note: There is no errors when I use Matlab Function block with no if statements.