How to display the file name with an error?

Question

css

How to display the name of the file where the error is?
Now only a piece of code is displayed
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Used plumber, console.log
but did not find the command.
Bug in gulp-crass plugin, presumably due to invalid css.
Maybe someone has experience how to make css valid using plugins
or any quick way.
Thanks

Answer 1

In plumber, you can pass an error handler function. Tried?