Computing with SWMM Solver - Error 211: Invalid Number

Good morning, 

I have encountered the error message below when computing my model using the SWMM solver in SewerGEMS.

"Error 211: Invalid number at line 5910 of [XSECT] section: D0034_OW RECT_OPEN 5 0 0 0 1"

It should be noted that I just had uninstalled and installed the latest version of SewerGEMS (10.03.04.53) along with the last patch set. 

Can someone please throw me a hint on what could be causing this error? Is it the geometry of the conduit?

Thanks,

Samir