This error message may be due to the presence of a comment inside the “decodingLayers_2” array. This may interfere with the line continuation operator and eventually lead to an error during run-time.
One way to avoid this is to avoid commenting inside the array definition. So, the updated code can be as follows
decodingLayers_2 = [ ...
createUpsampleTransponseConvLayer(2,8), ...
reluLayer, ...
convolution2dLayer(3,1,'Padding','same'), ...
clippedReluLayer(1.0), ...
regressionLayer];
