auto routing error messages

Summary:

What are the detailed explanation and the related configuration impacting the below auto-routing error messages ?

1 Assignment will cause Resource Preferences violation.
2 Activity has no Work Zones.
3 Assignment will cause unacceptable overdue of other activities.
4 Assignment will cause violation of the travel time restrictions.
5 Assignment will cause unacceptable overtime.
6 Field Resources with required skills or zones are not found at specified time.
7 Field Resources with required Work Zones are not found.
8 Assignment will cause link constraint violation.
9 Assignment will result in unacceptable overdue.
10 Assignment will cause unacceptable overtime of other activities.
11 Activity was moved while routing was running.
12 Improper cost configuration