Error enable EPO in MC60

I’m working on MC60 to receive GNSS data. I try to enable EPO fuction using AT+QGNSSEPO=1. Every step is working fine when i follow instructions in Quectel_MC60&MC90_GNSS_AGPS_Application_Note_V1.2 | Quectel. But i receive CME ERROR 7103 when enabling EPO. How can i fix this? Can anyone help !

Hi
AT+QGNSSEPO=1

Did you encounter error 7103 when executing the command “AT+QGNSSEPO=1”? This is impossible
The 7103 command means that the operation is not allowed to be executed. If you follow the AT manual normally, you will not encounter this error

AT+QIFGCNT=2 // Set PDP context
OK
AT+QICSGP=1,”CMNET”// Configure APN
OK
AT+CREG?;+CGREG? // Check network status
+CREG: 0,2
+CGREG: 0,2
OK
AT+CREG?;+CGREG? // Check network status
+CREG: 0,1
+CGREG: 0,1
OK
AT+QGNSSTS? // Read time synchronization status
+QGNSSTS: 1 // Time synchronization completed
OK
AT+QGREFLOC=31.844376,117.204536 // Set reference location information for QuecFastFix Online
OK
AT+QGNSSEPO=1 // Enable EPOTM function
OK
AT+QGNSSC=1 // Power ON GNSS
OK