How can I fix a wireless update glitch or reverse an update?

A pop-up message says "Application error: Unfortunately, Carefree Launcher has stopped" and allows me to exit or "send error report" whenever I try to access my home screen. This started happening ever since I updated my Blu Vivo 5. My phone only allows me to stay in multitasking mode and I ask Google to open apps but Google can't access all the apps I would like to get to.

Can anyone help me out so I can use my phone again?