playback engine don't support sample rate 48 khz

Just got pro tools 11.1.2 and 10.3.8 and every time I try to open one of my sessions from pro tools 8.0.5 or from pro tools express I get an error msg;



"The current playback engine does not support a sample rate of 48 kHz"



I've looked everywhere I can think of in the program to change the playback engine settings but I'm coming up empty. Help please?! :o