Uploaded file must be a non-empty zip (Service: Lambda, Status Code: 400

[Mathigowtham]

An error occurred: PdfLambdaFunction - Resource handler returned message: "Uploaded file must be a non-empty zip (Service: Lambda, Status Code: 400, Request ID: 8f2532e1-022f-44ff-abe3-89327128e634, Extended Request ID: null)" (RequestToken: 1ed75ad4-a796-2f0f-e377-425b9ef8027d, HandlerErrorCode: InvalidRequest).

I am getting this error while trying to run the example functions. please let me know if i am missing something.