I need to concatenate 2 different sets of CSV. Sometimes a group of them is missing, so I need only one of them. How can I do it without errors? [image]

Hello @andreahfp , this is an older thread where we discussed it but should still (hopefully) be applicable: [image] Error Handling for Excel Reader - send email if node failed KNIME Analytics Platform Hi guys, I am new to KNIME and currently I am trying to find out how to implement a proper error handling for my data manipulation flows. This is what I want to do: Read Excel File Data Manipulation Export CSV File if Success, then send email with success message if Error (e.g. Read Excel failed, because no file available), then send email with error message I played around with Try Catch nodes but I really have no clou how to configure and use them correctly. In my mind the flow should loo… Br, Ivan

Hello @andreahfp , You can us Try Catch nodes. Reference below examples [image] Error Handling with Try-Catch – knime Error Handling with Try-Catch This workflow demonstrates how to handle errors with the Try-Catch structure. In this example, the new contracts data are read fr… Just give a placeholder/ dummy file as second input to Concatenate node in case of errors. Thanks

@andreahfp could be something like this: [image] [image] Skip File if it does not exist using Try and Catch - KNIME Forum (80322) –... Demonstrates how to handle a missing file with Try / Catch nodes

optional concatenate

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mlauber71 June 12, 2024, 11:08am 4

@andreahfp could be something like this:

I have 2 ways of data preparation - how can I merge them together if one way could not be executed