Ionic install

when i want to install ionic here is the error message that appears i did everything i could do but still the same message
npm ERR! code EINVAL
npm ERR! syscall mkdir
npm ERR! path c:\Users\ <shortname-you-found-with-dir \x> \AppData\ Roaming \ npm-cache_cacache\tmp
npm ERR! errno -4071
npm ERR! EINVAL: invalid argument, mkdir ‘c:\Users\ <shortname-you-found-with-dir \x> \AppData\ Roaming \ npm-cache_cacache\tmp’