the first error means that the server does not support the pconnect function.
you can edit the connection file to use connect instead of pconnect.
for the second problem, Power CMS Builder is not supported on DW CS6, At this time, the only extensions we have that are compatible with DW CS6 are Design Extender, Data Bridge and eCart 5.
If you need to use Power CMS Builder in DW CS6, I would strongly urge you to upgrade to Design Extender which includes Power CMS Builder.
we will be evaluating the stand alone extensions in the coming months for compatibility but with 30 extensions, it will take some time to go through them all.