RoR errors, various

All Resolved.
Examples:

Countless "You have a nil object when you didn't expect it!
The error occurred while evaluating nil.priv_level"
– These were usually not code, but because of child record deletes in database during testing (referential integrity).
Fixed.

Error: "NoMethodError in Percentage statisticsController#create",
"undefined method `updated_by_user_id=' for #<PercentageStatistic:0xb68befdc>"
– was actually because temporary setting of field name used incorrect name.
Fixed.

Rails app & all page fetches not working at all!
Error:
./script/../config/../vendor/rails/railties/lib/initializer.rb:500:in `initialize_time_zone': Value assigned to config.time_zone not recognized.
when running script/server.
Had changed time zone in config/environments.rb file from 'UTC' to EST' but this did NOT work.
Commented out line altogether. This set time to EST and shows time zone as EDT (Eastern Dalight Time) – maybe would have worked too.
8/17/2020 – Updated tried EST, EDT and 'Eastern Time (US & Canada)' as shown in rake -T time but none worked, however commenting out as comment in code shows works and time displays immediately become local (EDT for me).
Anyway this works for me in Massachsuetts!
Fixed.

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