Try re-saving your file with encoding UTF-8 without bom.
Also sometimes Magento might complain on one field and the problem might be with other required values, so make sure you have entered them. Use this article to check -
Hi, I already tried encoding UTF-8 without bom. But not working. I checked that article but still not working. I tried all the solutions. How can I do I don't know :/
Do you use Dataflow or Import/Export? and what method have you used to export file?
Hmm, it is strange. The file structure looks like it was exported via DataFlow and you have attached screenshot for Export page.
You can try once again export file, do changes and then import it back, but this time try Import/Export for upload (System -> Import/Export). If you still experience issues, you can attach sample of your import file (just a few lines here).
Can you please clarify if you are importing new images for products?
I still can't import images for products. I tried almost all the solutions. Do you know plugin for import images?
In your file I see you have image path like i/m/imagename.jpg, so that is why I was asking - do you import existing images for products?
Usually when we add new images, we add them to media/import folder via FTP client. After that in the file we put images names with leading slash, like /image.jpg
There are multiple plug-ins, but to recommend the one it would be better if you explain your requirements to images import.