Cannot run MPC adaptive block

Hi,

I'm trying to run my simulink file but I'm receiving the following error:

Error evaluating 'InitFcn' callback of Adaptive MPC block (mask) 'balancerLTVMPC2012b/Adaptive MPC Controller1'.

Callback string is 'ampcblock_InitFcn'

Caused by:

Error using test_balancer (line 49)

Disturbance model "Output" must be an LTI object with 1 outputs.

I've tried exporting the file to a older version but it does not work.