Pushbutton function not working

I am trying to run a push button function that runs a code which calculates a value and then display the value in an edit field. This code worked in my first mlapp file but isnt working in this one. There is no error message but also no value.

% loads values from previous mlapp file.   

load('temp.mat','Ps','Rtotal','Vs','Cstern','Tf','Ta','B','L','Cm','nabla','LCB','Abt','rho','d_BT','At','hb','Cwp','Screw','D','Z','Pc','ks','dv') 
% Performs calculations...       
VoyageEnergykWh=EnergyManeouvring+EnergyJourney; % Voyage Energy in kWh
VoyageEnergyJ=VoyageEnergykWh/(1000*60*60); % Voyage Energy in Joules
answer=VoyageEnergykWh;
answer2=VoyageEnergyJ;
app.kWhTextArea.Value=num2str(answer);
app.JoulesTextArea.Value=num2str(answer2);

[Walter Roberson]

That would happen if either EnergyManeouvring or EnergyJourney were empty.

[Kieran Graham]

Hi Walter,

They both should have values as they are calculated from the values loaded in load(temp.mat)

[Mehmed Saad]

put a break point at that line in appdesigner code view and see if answer has any value, if yes

then see if app.JoulesTextArea.Visible is on or off

[Kieran Graham]

Sorry for me being useless but would you be able to explain how to execute a break point in appdesigner

[Mehmed Saad]

just remove the .zip from the end to make it capture-7.rar and then extract it there'll be a video inside it