Correct log output errors in Drupal 7

Employer
[no-member:pro]Vasily[/no-member:pro]
Project parameters
Type of cooperationPeriodic employment
SectionWeb development
Prepaymentprepayment is possible
Payment methodsElectronic money
Acceptance of requestsfrom May 24, 2019 until May 25, 2019
Project description
When opening the journal writes "file not found" The problem occurred after the database update (which follows after the system SMS update).
Anyone who knows how to use a DEV module or other error tracking methods will not be difficult to solve.
Once successfully completed, there will be other tasks related to this site.
The end result. I need to be told what to fix or which file to replace on the working version of the site.
Anyone who knows how to use a DEV module or other error tracking methods will not be difficult to solve.
Once successfully completed, there will be other tasks related to this site.
The end result. I need to be told what to fix or which file to replace on the working version of the site.