Why can't I take video on the Canon PowerShot SX700 HS anymore?

Why can't I take video on the Canon PowerShot SX700 HS anymore?

My Canon PowerShot SX700 HS was working perfectly fine, but suddenly, in between filming short videos (30 sec - 4 min) on my camera (about 2 years old), it displayed a 0" written in orange font at the top right after I hit the red button to stop recording.