You have sent a feed to Amazon and you get the following error message when you request the report:
Product Feed - N°: n Entry Result Error FeedProcessingResultNotReady Messages Logs Feed Submission Result is not ready for Feed n
This message indicates that the file was received by Amazon, but it has recently been sent and Amazon server has not yet had time to process it.
One must consider that there is a processing time between the time you send the file and the time it is processed and then the report is available.
You can certainly request again your report, it should be available now.