Emojify V3A error

I completed the Emojify Assignment in the jupyter notebook and it shows all the test passed. But when I submit the assignment the grader gives a score of 0/100 and shows the following result:
“Cell #14. Can’t compile the student’s code. Error: ValueError(‘matmul: Input operand 1 does not have enough dimensions (has 0, gufunc core with signature (n?,k),(k,m?)->(n?,m?) requires 1)’,)”

I dont know what is wrong.

There is probably an error in your code.

“Passing all the tests” does not mean your code is perfect. There are a lot of possible errors that are not tested.