I have an EEG data in .continuous format. I have codes to open the data file and plot it. Now I want to filter out signal with frequencies from 3Hz to 12Hz. I have used 2nd order butterworth filter but that removes the important peaks too. I have even tried doing it using EEGLAB toolbox but I cannot open my .continuous file in EEGLAB (error as shown in the picture). I have installed FIELDTRIP and tried again, it doesn't work. Could someone point out the possible things that I can do to solve my problem?
Thanks in advance.