The two information messages just preceiding the errors are the cause. You have used the (dedicated) pins for the LPComp by your UART.
First approach I usually take is to set all pins to <auto assign...> and let the fitter choose.
When you got stuck it is always advisable to post your complete project, so that we all can have a look at all of your settings. To do so, use
Creator->File->Create Workspace Bundle (minimal)
and attach the resulting file.