Unable to load custom Tensorflow model based on rfcn_resnet101_coco

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I used rfcn_resnet101_coco as a base to fine tune my model in tensorflow. However when I load this into OpenCV I get the following error:

OpenCV Error: Unspecified error (Unknown layer type Cast in op ToFloat)

This issue suggests passing the .pbtxt file into readNetFromTensorflow . A simple google search is enough to find ssd_mobilenet_v1_coco.pbtxt but I am unable to find this file for the specific model I am using.

Please guide me on how to go about loading my fine tuned model into OpenCV or creating the .pbtxt file.