It’s a PIC and they tend to handle a lot of different crystals, resonators, and external oscillators, but you occasionally have to change the programming to match what you’re using. The CV-12 spec just says “a 16MHz crystal and 2 x 22 pF capacitors” so seems they’ve designed for a load capacitance of ~15 pF. If you have something else, you should be able to tweak the caps.
(rule of thumb is to use 2×(CL−5) pF where CL is the load capacitance and 5 pF is estimated trace capacitance)