SSIS: How to lookup Multiple date to Fact table

I have a dimension table DimDate. I need to use it to get the surrogate key for my fact table. My fact table have multiple date, such as order date, pickup_date, delivery_date. I used multiple lookup transform to work on it, but when I work on the second lookup, I got the following error when I merge the match and nomatch together.

The component has detected potential metadata corrupton during validateion. Error at FactBOL data flow Task [SSIS.Pipeline]: The package contains two objects with the duplicate name of "output column" "DateKey" (13706)" and "output column "DateKey" (13703)".

I changed the output name, it still does not work.

Thanks for your help!