Trouble with syntax, either with the If/Then funcition or in properly using CVErr

Hi all, I've got another one for you today. This one might be complex but I highly doubt it. I'll do my best to explain the project below, I've attached a sample workbook if it helps.

All in all the workbook is designed to take the first worksheet and restructure it into a different format based on its contents. The button on sheet 1 runs a series of macros that do just that, and a lot of it is pretty straightforward and no doubt probably unnecessary. However, most of it works.

Where it doesn't seem to work is in the later stages: I have a function that searches the original array for a cell that has three corresponding values; "AlturaLookup" and the sub that generates the criteria for running AlturaLookup and loops it to populate the new format; "RunLookup"

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Now AlturaLookup works just fine in a vacuum, and I know there's some issues with getting RunLookup to populate the table in the right way, but where I'm having particular trouble is in this section of RunLookup

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Apparently

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seems to work, no errors or anything, but it just skips to the EndIf, so it seems like I'm equating the two improperly. What I want it to do is essentially: "If there's an error, run the function until there is no error; otherwise change the value of a cell based on the various counters that are running"

Does that make sense?

Thanks in advance to anyone who reads this, hope it's not too long.