Hard to find the source bug/problem:

DEBUG: solr.petspremium.de: (emulator) __file//etc/solr/solr.xml: Finished __file/etc/solr/solr.xml/.cdist {'mode': '0644', 'source': '/home/users/nico/.tmp/tmpn27s24/out/conf/type/__petspremium_solr/files/solr/solr.xml'}
+ for file in '$(find . -type f | sed '\''s,^./,,'\'')'
+ dfile=/etc/solr/web.xml
+ reqdir=/etc/solr
+ require=__directory/etc/solr
+ __file /etc/solr/web.xml --source /home/users/nico/.tmp/tmpn27s24/out/conf/type/__petspremium_solr/files/solr/web.xml --mode 0644
DEBUG: solr.petspremium.de: (emulator): /home/users/nico/.tmp/tmpn27s24/out/bin/__file: Namespace(mode='0644', object_id=['/etc/solr/web.xml'], source='/home/users/nico/.tmp/tmpn27s24/out/conf/type/__petspremium_solr/files/solr/web.xml')
DEBUG: solr.petspremium.de: (emulator) __file//etc/solr/web.xml: Recording requirement: __directory/etc/solr
DEBUG: solr.petspremium.de: (emulator) __file//etc/solr/web.xml: Finished __file/etc/solr/web.xml/.cdist {'source': '/home/users/nico/.tmp/tmpn27s24/out/conf/type/__petspremium_solr/files/solr/web.xml', 'mode': '0644'}
ERROR: solr.petspremium.de: Type __directory requires object id (is not a singleton type)
INFO: Total processing time for 1 host(s): 9.756716251373291
ERROR: Failed to deploy to the following hosts: solr.petspremium.de