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Usually with default EPiServer installation there are high chances that content with ID 3 will be "SysGlobalAssets". Do you have a page with ID 3 in your site?
Thank you for the reply Valdis. 
We have upgraded our site which was in EpiServer 5.2 R2 to EpiServer 7.0 .
As per our knowledge content id 1,2 & 3 are system reserved.
we dont have any page mapped to id 3.
here is tblcontent records for you ref.
| 
 pkID  | 
 fkContentTypeID  | 
 fkParentID  | 
| 
 1  | 
 1  | 
 NULL  | 
| 
 2  | 
 2  | 
 1  | 
| 
 505  | 
 71  | 
 1  | 
| 
 514  | 
 31  | 
 1  | 
| 
 517  | 
 32  | 
 1  | 
| 
 518  | 
 56  | 
 519  | 
| 
 519  | 
 32  | 
 517  | 
| 
 520  | 
 61  | 
 519  | 
| 
 521  | 
 60  | 
 519  |