What happens? What is the complete unedited word-for-word error message?
"Some import operations not performed"
Then in box:
"The following files were not imported because they could not be read. (355)
Hey, I solved it with hints from another thread! The poster was talking about ADD vs. COPY at the top of the window. Changing that did not work, but that led me to check out the TO area (destination folder) on the top right. The file receiving all the pics that was highlighted was the hard drive. When I clicked on it there was a drop down showing other folders, including "Pictures". I clicked on that and got "Lightroom", then "2015". I routed the TO to that and it worked!