Check your databse server,,,Since its not able to connect to database server its not able to retrieve any data ,
What database are you using? The on-box mysql or an external db like oracle, mssql, etc..
On both the WR and database servers, do you have adequate disk space?
Thank you for support. This problem, because my hard driver is full
Thank you all
There is one other important thing which is Rotate and push you have to make it modify too.
Also I am offering you to using web reporter on VM and also install it on "not C:\ Drive".