Error messages

What does the message "Could not find package..." mean?
Problem The Composer installation of a module in Magento 2 fails and the following error occurs: Could not find package ... at any version for your min...
Wed, 21 Mar, 2018 at 9:34 AM
What does the error "main.CRITICAL: Broken reference: No element found..." mean?
Problem After installing a Magento 2 module, this error occurs in the checkout: main.CRITICAL: Broken reference: No element found with ID 'checkou...
Wed, 13 Sep, 2017 at 1:29 PM
What does "TypeError: ... is not a function" mean?
This means that a JavaScript function couldn't be found. Maybe customized templates are being used and not all required JavaScript files are load...
Wed, 21 Mar, 2018 at 9:47 AM
What does the message "Can't use method return value in write context" mean?
Problem When executing Cronjobs, the following error occurs: Can't use method return value in write context in [...] Cause This message occurs ...
Thu, 24 Aug, 2017 at 10:13 AM
Summary of PHP errors and solutions
A very nice summary of common PHP errors with solution suggestions can be found here: https://stackoverflow.com/questions/12769982/reference-what-does-thi...
Wed, 21 Mar, 2018 at 9:35 AM
What does "Exception printing is disabled by default for security reasons" mean?
Problem The following message is shown in the browser: Exception printing is disabled by default for security reasons. Error log record number xxxxxxx...
Wed, 21 Mar, 2018 at 9:37 AM