Interferogram NEST 4B generation has failed working

Hi all,
My Interferogram NEST 4B generation has failed working. I used the TerraSAR-X imagery to produce the interferogram, but failed upon doing the computation part. Strange dialog box about computation appears.
It seems that the program is strange because the message in the dialog box is not clear. Please somebody explain how this strange error appeared. A sample screenshot is attached.

Thanks for any help regarding this problem.
