Why do I get "ERROR : cannot concatenate 'str' and 'NoneType' objects: whenever I try to upload a log file?

[hayloiuy]

I get this error whenever I try to upload a log file. What is the problem?

ERROR : cannot concatenate 'str' and 'NoneType' objects

[bunyk]

For me it happened because source csv file was generated with python without opening file with option newline="", so when I open it on for example Google Sheets, it looks like this:

Probably that empty rows are "NoneType".

UPD. Also, when I fixed empty rows, it still refused to upload file using Chrome on Windows. When I tried to do that using Firefox it was finally successful.

[cpetterborg]

How are you uploading (I assume from the "Add Data" option from the launcher, or a similar method, and not from a UF)?

Does this happen with any file, and if not, what is in the file?

[ralphreijs]

To me it happened with every file, and every file type.
Changing browser from Safari to Firefox fixed it.

[hayloiuy]

No problem now. I just changed the file type to .log.

[ralphreijs]

Was that a .csv file or a .log file with an incorrect file extension?