Pulldata function: something wrong with CSV file

What is the problem? Please be detailed.
I am working on an endline survey and this is the first time that I work with the pulldata() function. Basically I do everything correctly it seems, but collect does not load the data or gives an error. So I tried looking into the tutorial (http://xlsform.org/#how-to-pull-data-from-csv) which has an example file called pull_data with a CSV called 'fruits'. It turns out that when I download both in excel format and turn the 'fruits' file into CSV myself, it does not work. But when I download 'fruits' already as a CSV file, it does work! Apparently something goes wrong when I turn the data files into CSV, but what am I doing wrong?

What ODK tool and version are you using? And on what device and operating system version?
ODK Collect v1.15.0 on an android tablet.

Can we see your excel version and CSV version that you made?

Thank you for the quick reply. I solved the problem for myself now by using STATA instead to create a CSV file. This works. Perhaps my excel version is too old.

My guess is that there was a format issue with the CSV, probably with UTF-8 encoding.