I get the error "Aeroo Reports: Error while generating the report. ascii" when I try to print an aeroo report.

At this forum, I read that the problem is to use genshi 0.7, and that is solved installing genshi 0.6. The post is this:

https://www.odoo.com/es_ES/forum/ayuda-1/question/aeroo-reports-error-while-generating-the-report-ascii-34286

Odoo uses python 2.7, and genshi 0.6 is for python 2.6 and below, so i uninstalled genshi 0.7 and I tried genshi 0.6.1, but I still get the same error. Anyone knows a solution for this problem? Thanks in advice.