3CX [instance number] System Server stops after starting

[st1172]

Running 3CX 15 SP1 after a fresh upgrade from 14 SP3.

As the title says the System Server service starts, then stops immediately. The System Server log indicates only that the log was created. Please assist in troubleshooting as this affects call logging and voicemail operations.

Please assist me in troubleshooting this. Thank you!