when i upload a picture it says there is an error any suggestions
That's it? Does it say what kind of error?
Can you tell us what OS and GIMP version you are using? Perhaps list the steps you take when using GIMP to open an image, and what kind of image it is, etc.
"upload"... if this is the meaning described in http://en.wikipedia.org/wiki/Upload, it would be interesting to know where exactly you're trying to upload it?
will be even interesting know WHAT you are trying to upload and for doing WHAT
as example if you try to upload xcf files to display on the net that will never work
If you do for offer them for download that should work
If you upload jpg or png to a image host that should work
and so on