HTTP Status 404 - /pentaho/Home

Hello, i'm sorry if i write in bad category. I am new to the forum.
Version biserver-ce: (biserver-ce-6.0.1.0-386)
I have problems starting pentaho. A few days ago started properly. I was trying to solve another problem and I have modified the file context.xml in biserver-ce/tomcat/conf.
i have only comment the line:


<Manager pathname="" />

I don't solve my problem, but when i restart pentaho, on browser to localhost:8080 i have this error.

HTTP Status 404 - /pentaho/Home


type Status report


message /pentaho/Home


description The requested resource is not available.
Apache Tomcat/8.0.24

i have uncomment the line e restart pentaho but the error continues to exist.
You would know someone kindly help me? Thanks you all.