[Q] Phone boots to android animation. Mount/system error topic

I was trying to increase app storage space with HK Rom Expander. The description said after you apply changes and boot, it will take time. I waited for over an hour and decided to boot to recovery and factory reset the phone. It said Mount/system error. Now when i boot my phone all i see is the image i have uploaded below. The phone is rooted. Assist please.

Attached Thumbnails