How can I use the Faster R-CNN detector trained in MATLAB 2018a for testing the images in MATLAB 2017a?

Hi,

I used Faster R-CNN in MATLAB 2018a for training images and I tried to use the output detector for testing the images in MATLAB 2017a. Unfortunately, I got this error:

Struct contents reference from a non-struct array object.

Error in vision.internal.cnn.internalFastRCNNSeriesNetwork/setupNetworkForGPUPrediction (line 289)
                this.Layers{el} = this.Layers{el}.setupForGPUPrediction();

Error in vision.cnn.FastRCNN/activations (line 216)
                this.PrivateNetwork = this.PrivateNetwork.setupNetworkForGPUPrediction();

Error in fasterRCNNObjectDetector/detect (line 466)
            convmap = activations(this.Network, Iroi, [], ...

How can I use the detector trained in MATLAB 2018a for testing the images in MATLAB 2017a?

Thank you,

Abbas