Unable to select 'Files' option in Ambari

[#1]

And get the following error:

500HdfsApi connection failed. Check "webhdfs.url" property

And "java.lang.NullPointerException"

It is interesting to note that yesterday i was able to select. But today after changing password to 'admin' and restarting, i am unable to select this option.

[#2 · Accepted solution]

Restarted Ambari Server and Sandbox. And able to select Files now. Thanks.