I suspect it's date stamp. And that may be the issue... The space..? Janitor clean names may be your friend.
For this kind of code, I'd want to merge file by file. Because 150 loads will be a pain if it breaks at 120, then 121, then 122 etc... Especially if it's a slow loader.
So I'd ditch all the supply for now and load the two filenames given into myDataA and myDataB and merge with bind_rows as you have.
If they fail. Then look at A and B for the column (?date) and see what is wrong...