Error in BumbleBee package "...no attribute GetUpperBound"

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Hi!
I am facing a weird problem while working with BumbleBee package. It looks like a bug, but maybe I’m doing something wrong. It is very easy to reproduce this:

  1. Place the “Read Excel” node. (filePath: read below, runlt: True, sheetName, “Sheet1”, byColumn: True/False, origin:“A1”)
  2. You can create any number of tabs in the Excel table, but in one of the tabs in the first column (“A1” in this particular case) there should be only one value (“1.1” in this particular case)
  3. Run the script and you will receive an error:
Traceback (most recent call last):
  File "<string>", line 129, in <module>
  File "<string>", line 45, in ReadData
AttributeError: 'str' object has no attribute 'GetUpperBound'

I tried this on different versions of the package (2020.2.1, 2021.25.3)
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