Magento prompts “there has been an error processing your request”

The Magento exception log is recorded by default under Magento /var/report/.
For example, the following prompt appears on the page

There has been an error processing your request

Exception printing is disabled by default for security reasons.
Error log record number: 1610090137
This error is usually logged in
Magento /var/report/ 1610090137

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