If your content was rejected with “Vector is overlapping artboard bounds or is too small on the artboard, or there is more than one artboard in the file,” it is probably due to one of the following reasons:
Illustration is too small to view at full magnification
Vector illustration is too small to view in detail or be easily edited, even at 6400% which is the highest magnification in Adobe Illustrator CS6
Illustration is larger than the artboard
Vector illustration is significantly larger than the artboard
Illustration is outside of the artboard
Vector illustration is partially or entirely outside the artboard
Illustration contains multiple artboards
Vector illustration contains more than one artboard in the file
We recommend
View the entire illustration to make sure all vector elements are contained within the artboard
Remember that vector illustrations cannot be larger than 15MB
Be sure all the details of the design are visible, especially on smaller file sizes
Verify that the vector illustration can be edited easily at 6400% magnification or less
If the image is larger than the artboard or not contained within the artboard, adjust the vector so it fits within the artboard
Be sure the illustration has only one artboard
When using Inkscape or CorelDraw, please be sure to make your artboard size no longer than 600 pixels on the longest side.
Here are some additional resources you may find helpful:

