Depends on what the warnings are; run a debug build and find out what's wrong.
Ah, yes (it's years since the last time I did it), this is what comes out when using the cockpit mod with just the mediavps:
Warning: Duplicate sound name "4" found!
File: gamesnd.cpp
Line: 798
ntdll.dll! NtWaitForSingleObject + 21 bytes
kernel32.dll! WaitForSingleObjectEx + 67 bytes
kernel32.dll! WaitForSingleObject + 18 bytes
fs2_open_3_8_0_AVX-FASTDBG.exe! <no symbol>
fs2_open_3_8_0_AVX-FASTDBG.exe! <no symbol>
fs2_open_3_8_0_AVX-FASTDBG.exe! <no symbol>
fs2_open_3_8_0_AVX-FASTDBG.exe! <no symbol>
fs2_open_3_8_0_AVX-FASTDBG.exe! <no symbol>
fs2_open_3_8_0_AVX-FASTDBG.exe! <no symbol>
fs2_open_3_8_0_AVX-FASTDBG.exe! <no symbol>
fs2_open_3_8_0_AVX-FASTDBG.exe! <no symbol>
fs2_open_3_8_0_AVX-FASTDBG.exe! <no symbol>
fs2_open_3_8_0_AVX-FASTDBG.exe! <no symbol>
fs2_open_3_8_0_AVX-FASTDBG.exe! <no symbol>
fs2_open_3_8_0_AVX-FASTDBG.exe! <no symbol>
fs2_open_3_8_0_AVX-FASTDBG.exe! <no symbol>
fs2_open_3_8_0_AVX-FASTDBG.exe! <no symbol>
fs2_open_3_8_0_AVX-FASTDBG.exe! <no symbol>
fs2_open_3_8_0_AVX-FASTDBG.exe! <no symbol>
fs2_open_3_8_0_AVX-FASTDBG.exe! <no symbol>
kernel32.dll! BaseThreadInitThunk + 18 bytes
ntdll.dll! RtlInitializeExceptionChain + 99 bytes
ntdll.dll! RtlInitializeExceptionChain + 54 bytes
fs2_open_3_8_0_AVX-FASTDBG.exe! <no symbol>
PS: also while using it with FSport I noticed that a lot of the HUD elements were duplicated, the radar was both 3D and 2D at the same time and so were the throttle gauge and the weapon energy gauge toghether with the mission accomplished messages, and when using it "alone" (only with the mediavps that is) the subsystem brackets in the target display are outside the target box.