Less_Exception_Chunk thrown

ParseError: Unexpected input in anonymous-file-3430.less on line 1, column 1 1| . 2| { 3| input[type=file].form-control { 4| border: 0px solid #ccc; 5| -webkit-box-shadow: inset 0 0px 0px rgba(0,0,0,.075); 6| box-shadow: inset 0 0px 0px rgba(0,0,0,.075);