If you have received this error message, it means that the file you have uploaded is not set up correctly to produce a rubber stamp.
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To produce rubber stamps we require a black and white vector file. Pixel-based images cannot be used in rubber stamp files. The black used in your design must be 100% CMYK Black (0,0,0,100).

The design file should be right-reading (not flipped or inverted), ie. your file should be showing what the final ink imprint will look like when stamped onto paper.
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All fonts used in your stamp design need to be converted to outlines.
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Please also note that for the best stamp reproduction, we recommend the line thickness for all parts of your design to be at least 1pt - that includes the "white" lines or the negative spaces in between.
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Rubber stamps do not require bleed or a safety margin – your design can extend to the very edge of the stamp.