twrp unable to mount cache

i found out this issue a few mins ago. i have a n900t note 3 rooted and i was installing xnote 21 rom when the com.android.phone stopped workin when i went to dial a number. it dialed it and i heard them speaking but the pop up kept coming up and no one could hear me and i couldnt press anything. so i go online and ive been lookin up some fixes (factory reset or flashable fixes) and its not working . this led me to find out that the cache in twrp wasnt mounted and it cant be mounted ... neither was the system.... any help? please? i start a new job tomorrow and i need this phone