Derivative input 1 of 'mysp_smib​1/Subsyste​m/Transfer Fcn3' at time 0 is Inf or NaN. Stopping simulation. There may be a singularity in the solution.

The main model is:-

http://imageshack.us/photo/my-images/72/smibandsssc.png/

The subsystem is:-

http://imageshack.us/photo/my-images/525/smibandsssc1.png/

Another subsyste inside this subsystem is:-

http://imageshack.us/photo/my-images/59/smibandsssc2.png/

The error is:- Derivative input 1 of 'mysp_smib1/Subsystem/Transfer Fcn3' at time 0 is Inf or NaN. Stopping simulation. There may be a singularity in the solution. If not, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances).

Please help to rectify this error

[Walter Roberson]

It is not obvious as to whether anything changed in your question from the time you posted it a few days ago?