Need help with mailman bug

Hello,
I desperately need your help. We've been using Mailman newsletter lists for over 4 years now and it always worked fantastic. This morning we've moved to a different hosting / server and Mailman displays this bug:
Bug in Mailman version 2.1.18-1
We're sorry, we hit a bug!
Please inform the webmaster for this site of this problem. Printing of traceback and other system information has been explicitly inhibited, but the webmaster can find this information in the Mailman error logs.
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This message pops up in administration panel when I try to access the page where I usually confirm to send out or delete newsletters.
Can you help me? I can't send any newsletters out.
Thanks, Iva

On 07/21/2014 12:27 PM, iva.vianello@crorec.hr wrote:
See my comment in your bug report at <https://bugs.launchpad.net/mailman/+bug/1346468>.
-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan

On 07/21/2014 12:27 PM, iva.vianello@crorec.hr wrote:
See my comment in your bug report at <https://bugs.launchpad.net/mailman/+bug/1346468>.
-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan
participants (2)
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iva.vianello@crorec.hr
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Mark Sapiro