Res_pjsip.c missing?

Hello everyone good morning

[2019-08-23 10:01:10] ERROR[31806] res_pjsip.c: Unable to retrieve PJSIP transport ‘udp,tcp,ws,wss’
So this is the error log that i am getting and I’m just wondering where i can find the “res_pjsip.c”?
It that the reason why i am getting an error on the log because i dont have that file? And what does it do??

Thank You

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