MATLAB: SCRIPTING LANGUAGE

Why do i keep receiving this error? even though the variable is defined

for Numthour =1:25 *loop through each hour fprintf(Tprocessing hour in in? NumHour) for 1dx= datasubset model data to load io load the model data Bouriybata (Datalayer, i,:) = ncread (FileName, Contents. Variables (16x),Nane, ,. [StartLon, Startiat, Numinour], [Nunlon, Numbat, if); DataLayer = DataLayer +1i is step to the next 'layer' I end > SequentialProcessing processing hour 1 Processing hour 1 Unrecognized function or variable "Datalayer". Error in Sequentialerocessing (line 44) Hour lvData(DataLaver, i, 1) = ncread(fileNane, Contents, Variables (1dx), Naee