'ValueError: Shapes (None, 4) and (None, 11) are incompatible

I am training a CoVID Xrays Dataset. While training the model getting error as ValueError: Shapes (None, 4) and (None, 11) are incompatible

opt = Adam(lr=0.00001)
model_transfer_full.compile(loss='categorical_crossentropy', optimizer=opt,metrics=['accuracy'])
history = model_transfer_full.fit(train_x, y_train, batch_size=32, epochs=10, validation_data=(validate_x, y_val), 
                                  callbacks=[checkpointer],verbose=1, shuffle=True)

Getting error on callbacks.

Can someone tell where it is wrong?

python

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'ValueError: Shapes (None, 4) and (None, 11) are incompatible

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