The log seems incomplete, maybe there is more lines. Depending of your erp5 configuration, it might be required increase the number of partitions or just run it more times.
From: Wenjie ZHENG
Following message is from instance.log in web runner:
=============================
[2014-12-23 13:20:00,209] INFO ws.add(dist)
[2014-12-23 13:20:00,456] INFO Updating slap-configuration.
[2014-12-23 13:20:00,456] INFO Installing dynamic-template-erp5.
[2014-12-23 13:20:00,511] INFO While:
[2014-12-23 13:20:00,511] INFO Installing dynamic-template-erp5.
[2014-12-23 13:20:00,511] INFO
[2014-12-23 13:20:00,512] INFO An internal error occurred due to a bug in either zc.buildout or in a
[2014-12-23 13:20:00,512] INFO recipe being used:
[2014-12-23 13:20:00,512] INFO Traceback (most recent call last):
[2014-12-23 13:20:00,512] INFO File "/srv/slapgrid/slappart2/srv/runner/software/ec80c405d547ae923bc1ea845ec78921/eggs/zc.buildout-1.7.1_dev_SlapOS_005-py2.7.egg/zc/buildout/buildout.py", line 2157, in main
[2014-12-23 13:20:00,512] INFO getattr(buildout, command)(args)
[2014-12-23 13:20:00,512] INFO File "/srv/slapgrid/slappart2/srv/runner/software/ec80c405d547ae923bc1ea845ec78921/eggs/zc.buildout-1.7.1_dev_SlapOS_005-py2.7.egg/zc/buildout/buildout.py", line 802, in install
[2014-12-23 13:20:00,512] INFO installed_files = self[part]._call(recipe.install)
[2014-12-23 13:20:00,512] INFO File "/srv/slapgrid/slappart2/srv/runner/software/ec80c405d547ae923bc1ea845ec78921/eggs/zc.buildout-1.7.1_dev_SlapOS_005-py2.7.egg/zc/buildout/buildout.py", line 1588, in _call
[2014-12-23 13:20:00,512] INFO return f()
[2014-12-23 13:20:00,512] INFO File "/srv/slapgrid/slappart2/srv/runner/software/ec80c405d547ae923bc1ea845ec78921/eggs/slapos.recipe.template-2.6-py2.7.egg/slapos/recipe/template/jinja2_template.py", line 219, in install
[2014-12-23 13:20:00,512] INFO **self.context
[2014-12-23 13:20:00,512] INFO File "/srv/slapgrid/slappart2/srv/runner/software/ec80c405d547ae923bc1ea845ec78921/eggs/Jinja2-2.7.3-py2.7.egg/jinja2/environment.py", line 969, in render
[2014-12-23 13:20:00,512] INFO return self.environment.handle_exception(exc_info, True)
[2014-12-23 13:20:00,512] INFO File "/srv/slapgrid/slappart2/srv/runner/software/ec80c405d547ae923bc1ea845ec78921/eggs/Jinja2-2.7.3-py2.7.egg/jinja2/environment.py", line 742, in handle_exception
[2014-12-23 13:20:00,512] INFO reraise(exc_type, exc_value, tb)
[2014-12-23 13:20:00,512] INFO File "
======= End of message ==============