Error: 0x3 at Foreach Loop Container 2: Variable "User::Object" does not contain a valid data object

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VS2008

SSIS

Hi I have a SSIS job. While I run it, it will return me the error message as the title above. I have checked the variables that should have passed into the FOREACH loop and they are no empty as there are data return from SQL whenever I execute the SQL statement in my DB. As I cant find the option for me to upload my screen shot, therefore I will describe my error as detailed as possible:

Execute SQL Task --> Foreach Loop

Inside the loop it contains 3 variables, namely: varNumberFamilyItem, varSupplierCode and varNeedFTP with index 0, 1, 2 respectively. They are all under Variable Mappings.

Whereas inside my Collection, I have chosen ADO object source variable as User::Object and Enumeration Mode as "Rows in the first table". I have not configure any Expressions to overwrite the data returned.

But whenever I run my SSIS job, it will stop at Foreach loop and display the error message as the title above. Any help would be appreciated.

FYI, I have put my tasks inside Control Flow.