How do I get the "To file" to work??

I am trying to take data from my arduino analog input and write it into a .mat file in a "timeseries" save format. The error I keep recieving is as follows:

model error

The code generated for 'EMG_viewer/To File' cannot support Timeseries logging format using current target 'realtime.tlc'. Consider switching the logging format to Array or selecting a target that supports Timeseries format.

What am I doing wrong? My model only consists of 3 blocks. 'Analog input' , 'gain' (5/1025) , 'To File'. Thank you!