Task list issue: unable to complete ad hoc task - there is an error loading the form. The issue has been fixed in master [1], but in 6.3.0 it's still present. Please backport the fix to 6.3.0. Without it it's impossible to complete ad hoc tasks. Previously opened as [2]

[1] https://github.com/droolsjbpm/jbpm/commit/eae4320ba9d0b6d46bbc44745c5aad5880dfff44
[2] https://issues.jboss.org/browse/BPMSPL-218