More than one entity found for a single-object find method

Hi everyone...
I have this error when my webservice is running..I don't know what it means and what would be the best solution..
<pns:message>More than one entity found for a single-object find method.</pns:message>
it throws an Exception..

= More than one row found in a DB with the "unique" key supplied...
Your method is returning an object where it should return a collection ?

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