SSIS: Trying to fill variables with Execute SQL

this is the query in my SQL Task

SET NOCOUNT ON;
SELECT @pDeployments = CONVERT(VARCHAR(255),ISNULL(parameter_valueset,''))
FROM dbo.o_rpt_email_list_request_parameters
WHERE request_id = @request_id
AND parameter_name = 'Deployments';
SELECT @pSplit = CONVERT(VARCHAR(255),ISNULL(parameter_valueset,''))
FROM dbo.o_rpt_email_list_request_parameters
WHERE request_id = @request_id
AND parameter_name = 'Split';
SELECT @pTopDomain = CONVERT(VARCHAR(255),ISNULL(parameter_valueset,''))
FROM dbo.o_rpt_email_list_request_parameters
WHERE request_id = @request_id
AND parameter_name = 'TopDomain';
SELECT @pLinkURL = CONVERT(VARCHAR(255),ISNULL(parameter_valueset,''))
FROM dbo.o_rpt_email_list_request_parameters
WHERE request_id = @request_id
AND parameter_name = 'LinkURL';
SELECT @pLinkID = CONVERT(INT,ISNULL(parameter_valueset,'-1'))
FROM dbo.o_rpt_email_list_request_parameters
WHERE request_id = @request_id
AND parameter_name = 'LinkID';
SET NOCOUNT OFF;

@request ID is defined as an input parameter; the "@p..." parameters are all defined as output parameters.  The data types are precisely correct and double checked.

When the step is tested, I receive:

"Error: 0xC001F009 at Obtain Parameter names and values: The type of the value being assigned to variable "User::pDeployments" differs from the current variable type. Variables may not change type during execution. Variable types are strict, except for variables of type Object.
Error: 0xC002F210 at Obtain Parameter names and values, Execute SQL Task: Executing the query "SET NOCOUNT ON; SELECT @pDeployments = CONVERT(VAR..." failed with the following error: "The type of the value being assigned to variable "User::pDeployments" differs from the current variable type. Variables may not change type during execution. Variable types are strict, except for variables of type Object.". Possible failure reasons: Problems with the query, "ResultSet" property not set correctly, parameters not set correctly, or connection not established correctly."

There is no result set and the step has result set set to None.  I triple checked to ensure that the parameters are properly set up for output.  I simply need to fill these five user variables and for the life of me do not see the error.

Thanks for your help.

John