C4 Week1 assignment1 grader error

I’ve passed all of the tests in first programming project, but my grade is 50/100. The grader error is:
[ValidateApp | INFO] Validating ‘/home/jovyan/work/submitted/courseraLearner/W1A1/Convolution_model_Step_by_Step_v1.ipynb’
[ValidateApp | INFO] Executing notebook with kernel: python3
Tests failed on 2 cell(s)! These tests could be hidden. Please check your submission.

Sorry that we missed your question when you first posted it. I hope that you were able to find a solution under your own power, but if not please let us know and we can discuss more. Unfortunately the grader feedback is sometimes not very specific, but they have made some improvements since you originally posted this question.