Attempting to configure the trend graph results in http 404 page not found error.
1) Go to a job with trend grpahs displayed.
2) Click configure link (links to <Jenkins Server>/<Job>/warnings6/configure/?)
3) Click Save (links to <Jenkins Server>/<Job>/warnings6/configure/save)

Versions installed
Jenkins 1.481
Warnings 4.17
Static Code Analysis Plugin 1.47
Analysis Collector Plugin 1.33
Violations 0.7.11

Issues accesses Jenkins through the localhost path.