Cannot convert between unicode and non-unicode string data types (SSIS 2005)

I have an Excel Source component hooked to an OLE DB Destination component in my SSIS 2005 Data Flow Task.  After I mapped the excel columns to the OLE DB table columns i get these errors below.  I noticed that for the first error, the Excel Field format (when you mouse over the column name in the mappings section in OLE DB component) is of type [DTWSTR] and the corresponding SQL field from my SQL table that it's mapping to is of type [DT_STR] when mousing over that field in the mappings in the properties of my OLE DB component.  All table fields in SQL Server for the table I'm inserting into are of type varchar

TITLE: Package Validation Error
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Package Validation Error

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ADDITIONAL INFORMATION:

Error at Data Flow Task [OLE DB Destination [27]]: Columns "Commission Agency" and "CommissionAgency" cannot convert between unicode and non-unicode string data types.

Error at Data Flow Task [OLE DB Destination [27]]: Column "Product" cannot convert between unicode and non-unicode string data types.

Error at Data Flow Task [OLE DB Destination [27]]: Columns "Officer Code" and "OfficerCode" cannot convert between unicode and non-unicode string data types.

Error at Data Flow Task [OLE DB Destination [27]]: Columns "Agency Name" and "AgencyName" cannot convert between unicode and non-unicode string data types.

Error at Data Flow Task [OLE DB Destination [27]]: Columns "Agency Id" and "AgencyID" cannot convert between unicode and non-unicode string data types.

Error at Data Flow Task [OLE DB Destination [27]]: Columns "Tran Code" and "TranCode" cannot convert between unicode and non-unicode string data types.

Error at Data Flow Task [OLE DB Destination [27]]: Columns "User Id" and "UserID" cannot convert between unicode and non-unicode string data types.

Error at Data Flow Task [OLE DB Destination [27]]: Columns "Acct Number" and "AccountNumber" cannot convert between unicode and non-unicode string data types.

Error at Data Flow Task [DTS.Pipeline]: "component "OLE DB Destination" (27)" failed validation and returned validation status "VS_ISBROKEN".

Error at Data Flow Task [DTS.Pipeline]: One or more component failed validation.

Error at Data Flow Task: There were errors during task validation.

 (Microsoft.DataTransformationServices.VsIntegration)