acuPrep: *** ERROR: Invalid surface

Hi ,
I am performing Conjugate heat transfer analysis using Simlab & Acusolve with Moving reference Frame.

I meshed the model using simlab and assigned the boundary condition properly.

After submitting the run, I received this type of error:
acuPrep: Processing SURFACE_SET( "Interface_WINDINGS_2_windings_1_tet_tria3" )
acuPrep: *** ERROR: Invalid surface 1
acuPrep: *** ERROR: Invalid surface 2
acuPrep: *** ERROR: Invalid surface 3
acuPrep: *** ERROR: Error has occurred: terminate RUN
acuPrep: ------------------------------------------------------------------
acuPrep: Input CPU/Elapse time = 2.845470e+02 1.065770e+02 Sec
acuPrep: Proc. CPU/Elapse time = 0.000000e+00 0.000000e+00 Sec
acuPrep: Solar CPU/Elapse time = 0.000000e+00 0.000000e+00 Sec
acuPrep: DDC CPU/Elapse time = 0.000000e+00 0.000000e+00 Sec
acuPrep: Output CPU/Elapse time = 0.000000e+00 0.000000e+00 Sec
acuPrep: Total CPU/Elapse time = 2.849370e+02 1.074510e+02 Sec
acuPrep: Total Memory Size = 2.757000e+03 Mbytes
acuRun: *** ERROR: error occurred executing acuPrep

In the log file , there is lot of invalid surface and I mentioned some message for reference.

How to resolve this type of errors in acusolve?

Thanks & Regards,
Sivaprakash.