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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 | 
