Tesseract 3.04.00 on mac, ERROR "can not open input file" - tesseract

I am working in a Terminal on OSX. The file name is sample and it is a png file. Tesseract creates an out.txt file in my current directory, but it's empty. I have tried commands with different file types, such as tiff, and also tried entering the full input file path, but the same error occurs.
What does the error mean?
eugeneprokopenko$ tesseract sample out
Tesseract Open Source OCR Engine v3.04.00 with Leptonica
ERROR: Can not open input file sample
Error during processing.

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