Error during alpha diversity analysis

Hi, i encounter an error for my dataset everytime i try running the alpha diversity analysis (as shown below), but it is fine for other analysis or visualization. My dataset is in .txt format, I tried using .csv format but the problem is still the same.

Anyone encounter similar problem? Please advise me how you solved it. Thank you.

Screenshot 2024-08-01 at 3.47.54 PM|690x431

Please carefully read & follow our post guidelines