automount: warning: could not read at least one map source after waiting, continuing ...

Issue

• The messages are observed every time autofs service restarts.

# service autofs restart

[/var/log/messages]

Nov 20 13:31:44 localhost automount[11081]: problem reading master map, maximum wait exceeded
Nov 20 13:31:44 localhost automount[11081]: automount: warning: could not read at least one map source after waiting, continuing ...