There was an unexpected error (type=Internal Server Error, status=500)

problem¶

Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.

Wed Jan 15 17:18:28 CST 2020
There was an unexpected error (type=Internal Server Error, status=500).
500 null

solution¶

Error 500 is reported, the error may be the writing error of the background sql statement

Can't get the value of db_source, change it to a fixed value