[Q&A] [SM-T311] [ROM] Please insert an SD Card before using camera on CM12.1

yesterday i flashed cyanogenmod 12.1 on my SM-T311. The flashing is complated and worked. but when i want to open camera it said "insert an SD card Before using camera". i'm already insert an 16gb sd card and also inserted another SD card but still it said that. any solution please?