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I have two data streams which need to be unioned together. One of the data streams often contains no data which is causing the union tool to encounter an error, input was not initialized. I have read through other discussions and have tried adding a text input, another .xlsx file with a single blank line, adding a block until done, etc. Nothing seems to resolve the error.
My only try would be to include an text input with null data and union it with the second dynamic input before the main union, or to include a select tool after the second dynamic input (to generate metadata).
got the same issue with a union tool as well. first time I deleted the union tool replaced it and it ran oke (forgot to save) day after same issue but couldn't update the union tool without getting the same error on an other union tool in the same workflow.
after this I used a production workflow where this error wasn't happening. strange part is it was the same workflow only saved on a different location.
so a tip in sort of fixing this issue could be try and use a back-up or acceptance,development or production (where the error isn't there) and copy the workflow over it (via fileserver)
I've got a similar post. i might help you out @mschmeiser