Why do i receive Uncoonected input?

netWidth = 16;
layers = [
    imageInputLayer([224 224 3],'Name','input')
    
    convolution2dLayer(3,netWidth,'Padding','same','Name','convInp')
    
    batchNormalizationLayer('Name','BNInp')
    
    reluLayer('Name','reluInp')
   
    convolutionalUnit(netWidth,1,'S1U1')
    additionLayer(2,'Name','add11')
    reluLayer('Name','relu11')
    convolutionalUnit(netWidth,1,'S1U2')
    additionLayer(2,'Name','add12')
    reluLayer('Name','relu12')
    
    convolutionalUnit(2*netWidth,2,'S2U1')
    additionLayer(2,'Name','add21')
    reluLayer('Name','relu21')
    convolutionalUnit(2*netWidth,1,'S2U2')
    additionLayer(2,'Name','add22')
    reluLayer('Name','relu22')
    
    convolutionalUnit(4*netWidth,2,'S3U1')
    additionLayer(2,'Name','add31')
    reluLayer('Name','relu31')
    convolutionalUnit(4*netWidth,1,'S3U2')
    additionLayer(2,'Name','add32')
    reluLayer('Name','relu32')
    
    averagePooling2dLayer(8,'Name','globalPool')
    
    fullyConnectedLayer(2,'Name','fcFinal')
    
    softmaxLayer('Name','softmax')
    
    classificationLayer('Name','classoutput')
    ];

lgraph = layerGraph(layers);

lgraph = connectLayers(lgraph,'reluInp','add11/in2');

lgraph = connectLayers(lgraph,'relu11','add12/in2');

skip1 = [
    convolution2dLayer(1,2*netWidth,'Stride',2,'Name','skipConv1')
    batchNormalizationLayer('Name','skipBN1')];

lgraph = addLayers(lgraph,skip1);

lgraph = connectLayers(lgraph,'relu12','skipConv1');

lgraph = connectLayers(lgraph,'skipBN1','add21/in2');

lgraph = connectLayers(lgraph,'relu21','add22/in2');

skip2 = [
    convolution2dLayer(1,4*netWidth,'Stride',2,'Name','skipConv2')
    
    batchNormalizationLayer('Name','skipBN2')];

lgraph = addLayers(lgraph,skip2);

lgraph = connectLayers(lgraph,'relu22','skipConv2');

lgraph = connectLayers(lgraph,'skipBN2','add31/in2');

lgraph = connectLayers(lgraph,'relu31','add32/in2');

options = trainingOptions('sgdm', 'MiniBatchSize',128,'MaxEpochs',10,'InitialLearnRate',1e-4,'ExecutionEnvironment','parallel');

%[trainedNet1,traininfo] = trainNetwork(trainData,lgraph,options);
class = trainedNet1;

convnet= trainNetwork(trainData,layers,options);

Hello Community, please I have a problem with this code, when i run it they said:

Error in NOUVEAU (line 107)

convnet= trainNetwork(trainData,layers,options);

Caused by:

Layer 'add11': Unconnected input. Each layer input must be connected to the output of another layer.

Detected unconnected inputs:

input 'in2'

Layer 'add12': Unconnected input. Each layer input must be connected to the output of another layer.

Detected unconnected inputs:

input 'in2'

Layer 'add21': Unconnected input. Each layer input must be connected to the output of another layer.

Detected unconnected inputs:

input 'in2'

Layer 'add22': Unconnected input. Each layer input must be connected to the output of another layer.

Detected unconnected inputs:

input 'in2'

Layer 'add31': Unconnected input. Each layer input must be connected to the output of another layer.

Detected unconnected inputs:

input 'in2'

Layer 'add32': Unconnected input. Each layer input must be connected to the output of another layer.

Detected unconnected inputs:

input 'in2'