Open paths: all filled shape paths must be closed.
Raster images: do not embed pixel-based images (JPEGs) into your vectors files—because they are not vectors.
Autotrace: Do not use autotrace on complex images like photos. The resulting vectors are too difficult for a customer to edit.
Artboard size: Your artboard must be a minimum of 15 megapixels or it cannot upload through the Contributor portal.
The lines in the arrow seem to be jagged.