Some errors on sigmoidGrad

Hi guys, i´m new here and in tensorflow world.

I´m trying to convert un model to onnx file. I´m using tf2oonx package and give me this errors.

ERROR - Unsupported ops: Counter({‘SigmoidGrad’: 2, ‘StridedSliceGrad’: 1})
ERROR - Tensorflow op [StatefulPartitionedCall/gradient_tape/grad_cam__class/model/Head_fc/swish_activation_1/Sigmoid/SigmoidGrad: SigmoidGrad] is not supported
ERROR - Tensorflow op [StatefulPartitionedCall/gradient_tape/grad_cam__class/model/Head_out_fc/Sigmoid/SigmoidGrad: SigmoidGrad] is not supported

I dont know if i´m in the right place, sorry if i´m not.
Best regards Gonçalo Marques