Entity creation throws an error but creates Entity

Hi All,

I tried to create an Entity and every time it throws the Error with error log as:

Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=8.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: The schema name new_sales_1 is not uniqueDetail:
<OrganizationServiceFault xmlns:i="www.w3.org/.../XMLSchema-instance" xmlns="schemas.microsoft.com/.../Contracts">
<ActivityId>99693991-0513-461e-bd43-ea3c5e22e66b</ActivityId>
<ErrorCode>-2147192821</ErrorCode>
<ErrorDetails xmlns:d2p1="schemas.datacontract.org/.../System.Collections.Generic" />
<Message>The schema name new_sales_1 is not unique</Message>
<Timestamp>2017-08-07T04:35:11.767789Z</Timestamp>
<ExceptionRetriable>false</ExceptionRetriable>
<ExceptionSource i:nil="true" />
<InnerFault i:nil="true" />
<OriginalException i:nil="true" />
<TraceText i:nil="true" />
</OrganizationServiceFault>

But the Entities were created in solution.

My question is why were the Error thrown even though the Entities are created.

Thanks,

Anita