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				#====================== BEGIN GPL LICENSE BLOCK ======================
				#
				# This program is free software; you can redistribute it and/or
				# modify it under the terms of the GNU General Public License
				# as published by the Free Software Foundation; either version 2
				# of the License, or (at your option) any later version.
				#
				# This program is distributed in the hope that it will be useful,
				# but WITHOUT ANY WARRANTY; without even the implied warranty of
				# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
				# GNU General Public License for more details.
				#
				# You should have received a copy of the GNU General Public License
				# along with this program; if not, write to the Free Software Foundation,
				# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
				#
				#======================= END GPL LICENSE BLOCK ========================

				# <pep8 compliant>

				#=======================================================================
				# Error handling
				#=======================================================================


				class MetarigError(Exception):
				""" Exception raised for errors.
				"""
				def __init__(self, message):
				self.message = message

				def __str__(self):
				return repr(self.message)