One reason for the error message may be, that it is actually an annotation, that is invalid, but is in the vendor code. Then you should ignore them.
Doctrine\Common\Annotations\AnnotationException : [Semantical Error] The annotation "@suppress" in method Monolog\Formatter\LineFormatter::normalizeException() was never imported. Did you maybe forget to add a "use" statement for this annotation?
If you ignore the annotation with the static call to in the config/bootstrap.php: