When starting Galaxy after updating it we get the assertion errors that follow the following format:

galaxy.datatypes.registry ERROR 2014-10-14 15:51:40,004 Error loading display application (./display_applications/ucsc/bam.xml): Filename and id attributes required for dynamic_links
Traceback (most recent call last):
  File "/home/galaxy/galaxy-dist.old/lib/galaxy/datatypes/registry.py", line 576, in load_display_applications
    display_app = DisplayApplication.from_file( config_path, self )
  File "/home/galaxy/galaxy-dist.old/lib/galaxy/datatypes/display_applications/application.py", line 170, in from_file
    return cls.from_elem( parse_xml( filename ).getroot(), datatypes_registry )
  File "/home/galaxy/galaxy-dist.old/lib/galaxy/datatypes/display_applications/application.py", line 183, in from_elem
    for link in DynamicDisplayApplicationBuilder( dynamic_links, rval, datatypes_registry.build_sites ):
  File "/home/galaxy/galaxy-dist.old/lib/galaxy/datatypes/display_applications/application.py", line 91, in __init__
    assert filename is not None, 'Filename and id attributes required for dynamic_links'
AssertionError: Filename and id attributes required for dynamic_links