Changes in text content not reflected on (non-english) site

Sorry, this is not quite my domain. What information do you need?

Let’s start with this:

ArgumentError (bad argument (expected URI object or URI string)) /usr/local/lib/ruby/2.6.0/uri/common.rb:739:in `URI'

and

Failed to handle exception in exception app middleware : bad argument (expected URI object or URI string)