The issue could also be caused by a filter entry in the build configuration.
If the path has been excluded in your configuration, e.g. excluded_paths:["lib/*"],
you can move it to the dependency path list as follows:
It is not recommended to use PHP's closing tag ?> in files other than templates.
Using a closing tag in PHP files that only contain PHP code is not recommended
as you might accidentally add whitespace after the closing tag which would then
be output by PHP. This can cause severe problems, for example headers cannot be
A simple precaution is to leave off the closing tag as it is not required, and
it also has no negative effects whatsoever.