Check propane supply tank and connection to the tank to be sure it is tight.

If it is a new propane tank or just a refilled tank, slowly open the propane tank valve all the way, so you don't activate the excess flow valve which reduces or stops flow of LP in hose.

Check connections to tip switch. If good remove wires from the tip switch and using a paper clip connect the two red wire connections together coming off the tip switch to bypass the tip switch. If this works replace tip switch.

Check to be sure the connection from the thermocouple to the safety control valve is tight. If pilot still goes out you may have to replace the thermocouple or the control valve.