这个提示是什么原因造成的呢？

滕小辉

KILL code number        Overlay number    Nearby statement number
% s. h+ d! J3 I5 f) c: P   422                          1                         0
  I& U% _1 }8 F0 {2 J! `KILL = 422.  
9 P# G) e) }4 C+ hThe present statement is interpreted as a value assignment statement, and the preceding name is interpreted as a variable to which a value is being assigned.  The identification of this variable is interpreted as complete, and should now be followed by ":=",in the following format: variable_identification := expression