Message at the console

I have created a table using the following command
CREATE TABLE metricsreporttable(id VARCHAR(150) NOT NULL,sitename
VARCHAR(155),title VARCHAR(160),type VARCHAR(165),count INTEGER,categoryid
VARCHAR(170));

When I start inserting rows into this table I get the following error
message in the console.

"Attribute metricsreporttable.oid must be GROUPed or used in an aggregate
function"

What might be the problem?

Thanks and Regards,
Kallol.