that is not error but a warning message and node should be able to execute just fine. By design every value that can not be parsed as number is replaced with missing values. Can you check output of String to Number node after execution?
thank you for response. Actually yes, the workflow did function well but the thing is string to number node deleted the entries with # . So when I take the data out from the KNIME, I get blank Space
and you want # sign when you export your data? Why is that if I may ask? And where do you export your data/which node do you use? Number type column in KNIME cannot have # sign.
I’d go down the route of splitting your year using regex, this way you can cleanly convert the first output to numbers and do as you wish with the rest -