ValueError: too many values to unpack

Migrating from 7.0 to 8.0
From migration.log

Thank you

2014-09-24 20:54:45,947 16155 ERROR Tek-Studio_migrated OpenUpgrade: project_issue: error in migration script /var/tmp/openupgrade/8.0/addons/project_issue/migrations/8.0.1.0/pre-migration.py: too many values to unpack
2014-09-24 20:54:45,947 16155 ERROR Tek-Studio_migrated OpenUpgrade: too many values to unpack
Traceback (most recent call last):
  File "/var/tmp/openupgrade/8.0/server/openerp/openupgrade/openupgrade.py", line 583, in wrapped_function
    func(cr, version)
  File "/var/tmp/openupgrade/8.0/addons/project_issue/migrations/8.0.1.0/pre-migration.py", line 36, in migrate
    openupgrade.rename_columns(cr, column_renames)
  File "/var/tmp/openupgrade/8.0/server/openerp/openupgrade/openupgrade.py", line 141, in rename_columns
    for (old, new) in column_spec[table]:
ValueError: too many values to unpack
2014-09-24 20:54:45,947 16155 CRITICAL Tek-Studio_migrated openerp.service.server: Failed to initialize database `Tek-Studio_migrated`.
Traceback (most recent call last):
  File "/var/tmp/openupgrade/8.0/server/openerp/service/server.py", line 894, in preload_registries
    registry = RegistryManager.new(dbname, update_module=update_module)
  File "/var/tmp/openupgrade/8.0/server/openerp/modules/registry.py", line 299, in new
    openerp.modules.load_modules(registry._db, force_demo, status, update_module)
  File "/var/tmp/openupgrade/8.0/server/openerp/modules/loading.py", line 369, in load_modules
    force, status, report, loaded_modules, update_module, upg_registry)
  File "/var/tmp/openupgrade/8.0/server/openerp/modules/loading.py", line 276, in load_marked_modules
    loaded, processed = load_module_graph(cr, graph, progressdict, report=report, skip_modules=loaded_modules, perform_checks=perform_checks, upg_registry=upg_registry)
  File "/var/tmp/openupgrade/8.0/server/openerp/modules/loading.py", line 159, in load_module_graph
    migrations.migrate_module(package, 'pre')
  File "/var/tmp/openupgrade/8.0/server/openerp/modules/migration.py", line 179, in migrate_module
    mod.migrate(self.cr, pkg.installed_version)
  File "/var/tmp/openupgrade/8.0/server/openerp/openupgrade/openupgrade.py", line 583, in wrapped_function
    func(cr, version)
  File "/var/tmp/openupgrade/8.0/addons/project_issue/migrations/8.0.1.0/pre-migration.py", line 36, in migrate
    openupgrade.rename_columns(cr, column_renames)
  File "/var/tmp/openupgrade/8.0/server/openerp/openupgrade/openupgrade.py", line 141, in rename_columns
    for (old, new) in column_spec[table]:
ValueError: too many values to unpack
2014-09-24 20:54:45,947 16155 INFO Tek-Studio_migrated openerp.service.server: Initiating shutdown
2014-09-24 20:54:45,947 16155 INFO Tek-Studio_migrated openerp.service.server: Hit CTRL-C again or send a second signal to force the shutdown.