Yes. Looks like it's out of memory.
Allowed memory size of 134217728 bytes exhausted (tried to allocate 29413376 bytes) on line 248 in /home/yourdomain/public_html/blesta/app/views/admin/default/structure.pdt Printing Stack Trace: #0 [internal function]: UnknownException::setFatalErrorHandler()
#1 {main}