Programm crashes even when trying to load the example data

[JLuc3141]

Traceback (most recent call last):
File "E:\Anaconda\lib\site-packages\batch_iv_analysis\gui.py", line 1222, in openCall
self.newFiles(fullPaths)
File "E:\Anaconda\lib\site-packages\batch_iv_analysis\gui.py", line 960, in newFiles
self.analyzer.processFiles(fullPaths, self.processFitResult, self.primeRow)
File "E:\Anaconda\lib\site-packages\batch_iv_analysis\ivAnalyzer.py", line 315, in processFiles
fileDatas = ivAnalyzer._loadFile(fullPath)
File "E:\Anaconda\lib\site-packages\batch_iv_analysis\ivAnalyzer.py", line 496, in _loadFile
raise ValueError("Unknown input file type!")
ValueError: Unknown input file type!

Hey, I installed your tool to try and run my data through it. And encountered this error on my first test with the provided data. How do i need to change the input file type. The system is Windows 10 and I used the guide in the repository for installation.

BR