The command /execute wasn't working in command blocks. It said in the previous output "Unknown command, try /help for a list of commands" Below is a screenshot inside the command block.
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Also, the type argument selector has to be Snowball, not snowball.
This is important because Minecraft is case-sensitive.
That's also the reason why the command block wasn't working,
it just didn't detect the entity "snowball" and it shows the latest output, in this case
the output which was generated when the command block was activated and the
command block, without a command in it, gave that output.
was the commandblock activated before the command was inserted, because when you trow a snowball now, it should work and output