Fixes #5614: Make the error message clearer for duplicate technique id
Merge pull request #55 from fanf/bug_5614/make_duplicate_technique_error_message_clearer

Fixes #5614: Make the error message clearer for duplicate technique id
Merge branch 'branches/rudder/2.6' into branches/rudder/2.10
Merge branch 'branches/rudder/2.10' into branches/rudder/2.11