Elephant Distort pattern white lines

Hi

I have created a pattern for printing on a watering can. This pattern is a set size so that it is continuos when printed around all the way around the can. Also being a curved watering can the design is curved so I need to warp the design to fit the cutterguide.

I have created a design and used the Elephant Distort tool to warp it to fit the cutterguide, but I get white lines on the pattern joins, on the illustrator files, plkus when I try to export it to either PDF, TIFF or Photoshop files.

Any advice on how to get this to work?

Thanks
Mark