error while writing pickfile

[maxgav13]

After picking with Refrapick.py and trying to write the pick file I get the following error and only the picks for the first two shots are written to the file

File "/Users/max/Downloads/software/Python/Refrapy/Refrapick.py", line 1578, in savePicks outFile write ("%d %d %.6f\n"%(s, g, t))
TypeError: %d format: a real number is required, not numpy ndarray

[RyGuy-NCC1701]

I have an instructor wanting to use this in a computer lab, and he's encountering the same error when trying to save a pick file (see below). Any suggestions would be welcome - I am not familiar with this software, just a support tech who manages the classroom PCs.

Error: 1
TypeError Exception in Tk callback
Function: <bound method Refrapick.savePicks of <refrapy.refrapick.Refrapick object .>> (type: <class 'method'>)
Args: ()
Traceback (innermost last):
File "C:\Users\username\pipx\venvs\refrapy\Lib\site-packages\Pmw\Pmw_2_1_1\lib\PmwBase.py", line 1761, in call
return self.func(*args)
File "C:\Users\username\pipx\venvs\refrapy\Lib\site-packages\refrapy\refrapick.py", line 1812, in savePicks
outFile.write("%d %d %.6f\n" % (s, g, t))
TypeError: %d format: a real number is required, not numpy.ndarray