Error: missing operand at _@_ in expression "round(150* _@_)"

I have installed all the depended software accordingly, and started the PolSARpro 6.0 with wish.
After a successful opening, I tried some buttons, it worked, then I quited.
The second time I open the software, after clicking the Entry button, I got this Error:

I also tried PolSARpro 5.1.3, but got this Error:

I’m having the same 150 * @ error. Quite cryptic, I should say…