Single line change error

Hi,

I have an error in the single line change model. Someone knows how to deal with this error?

Checking references and data in System Model
Checking references and data in System Misc
Checking references and data in System Body
Checking references and data in System Rear subframe
Checking references and data in System Rear linked solidaxle susp
Checking references and data in System Rear shock absorber ( with inline jts )
Checking references and data in System Rear coil spring
Checking references and data in System FIALA / HTIRE
Checking references and data in System Live axle
Checking references and data in System Frnt subframe
Checking references and data in System Rackpin steering
Checking references and data in System Steering column 1  (not for abaqus)
Checking references and data in System Frnt multilink susp
Checking references and data in System Shock System 0
Checking references and data in System Spring System 0
Checking references and data in System Single lane change analysis
   1 Error:   Unknown symbol model.sys_steering.sys_column.str_req.id           
              Error resolving entity Single lane change Report-arg5 under
              Model-Single lane change analysis.
Checking references and data in System Steer controller
Checking references and data in System Drive torque controller
Finished Checking Model 
Errors were detected in the model.

Thanks in advance,