no app2sd partition found. skipping format of /sd-ext. error mounting /sdcard/.android_secure

[Android Central Question]

im using walton primo rx2 . recently i tried to install a custom rom after that iv noticed my phones built in internal storeg showing as a sdcard. i v tried to move apps to internal phone storage but i couldnt. i think i somehow distroied the link app2sd . i wasnt not using any external sd card . can u pls help me