Exclusively opened by another application error.

We have been running PDM for a while now. Over the past couple of weeks we have started getting the error "An attempt was made to access a file that was exclusively opened by another application" My button options are OK, OK TO ALL, CANCE. This error seems to happen on Assembly's.I can't seem to trace the root of this issue. Any assistance would be great.

thanks,

Luke

SolidworksSolidworks Pdm enterprise Pdm