Bug - Dimensionality reduction by Amplitude

[Wmdhampton]

When I try to select Amplitude option from this drop down menu I get the following error:

Reference to non-existent field 't_before'.

Error in crabsort/Amplitude (line 31)
idx = floor(self.pref.t_before/self.dt*1e-3);

Error in crabsort/reduceDimensionsCallback (line 43)
method(self);

Error in crabsort/makeGUI>@(varargin)self.reduceDimensionsCallback(varargin{:}) (line 137)
handles.method_control =
uicontrol(handles.dim_red_panel,'Style','popupmenu','String',dim_red_plugins,'units','normalized','Position',[.65 .04 .34
.9],'Callback',@self.reduceDimensionsCallback,'FontSize',self.pref.fs);

Error while evaluating UIControl Callback.