Error on entering html file

Signaling: (buffer-read-only #<killed buffer>) signal(buffer-read-only (#<killed buffer>)) byte-code("..." [buf data kill-buffer signal] 3) find-file-noselect("/tmp/new.htm") find-file("/tmp/new.htm" nil) call-interactively(find-file) recursive-edit() byte-code("..." [print-escape-newlines print-length debugger-buffer debugger-value standard-output debugger-args pop-to-buffer erase-buffer t 50 backtrace debugger-mode re-search-forward "\n[* ] debug(" 1 debugger-reenable (lambda debug) "Entering:\n" debug backtrace-debug 3 delete-char ?* 0 exit "Return value: " prin1 ?\n ?\ error "Signaling: " "Beginning evaluation of function call form:\n" nil message "" recursive-edit buffer-read-only inhibit-trace] 3) debug(error (undefined-keystroke-sequence [#<keypress-event |>]))