I cleared two cache areas. Messages of error still showed up, but then I just restarted my phone.
First Cache
1. Go to Settings
2. Select Apps
3. Scroll to find "Messages" App, Select it
4. Tap Storage
5. Tap "Clear Cache"
**DO NOT CLEAR DATA**
Second Cache
1. Go to Settings
2. Select Device Maintenance
3. Tap Storage
4. Clear unnecessary cache data
RESTART YOUR PHONE
hope this helps~~