Sholl Error: points were outside the image volume

When I run Sholl analysis using Fijii on SWC trace files I receive an error message:

[WARNING] [SNT] 328 points were outside the image volume - you may need to change your SWC import options

I tried to change all kind of settings in the options I could find, with no change in error message. However I cannot find really “import” options for SWC. Has anybody experienced this problem before and can help me out. Thank you