Workbench IS installation errors in Eclipse (for vCO Plugin SDK)

Hi,

I've tried several times to install the Workbench IS that comes packaged with the vCO Plugin SDK and every time there is an error.  When I restart Eclipse there are no errors, but I'm not sure if there's any way to avoid this?  I've tried it with Spring Tools Suite 3.4.0 and 3.3 (which is supposed to be supported).

I've attached a screenshot, and the log file.

Thanks