Unknown error when import the raw EEG data to EEGLab

When I import the raw EEG data to EEGLab, report error:pop_biosig(line 89) Unsuported data format.
My import way is File-> Import Data -> Using EEGLAB functions and pluggings -> From EDF/EDF+/GDF files(BIOSIG toolbox). and My Matlab Version is R2016a, eeglab is eeglab14_1_0b.