What tool are you using to deploy the files? I recommend FileZilla.
I've seen cases where xml files were getting mangled during upload using some tools.
I would look at the file on the server: /Setup/applications/STS_EventCalendar/FeatureDefinitions/40000_EventCalendarModule.config
and verify if it is well formed xml or not, compare the copy on the server vs the copy in the Event Calendar Pro package. Is it getting changed somehow during upload?
You might also check the file /Setup/applications/sharedfiles/FeatureDefinitions/90000_SharedFilesModule.config
Its not clear to me if the error is happening for that feature or the feature it tries to configure next, which is probably Event Calendar Pro.
Hope it helps,
Joe