HP 33s - Manual (Page 351)

Messages F–3
 % !! Attempted to refer to a nonexistent program label (or
line number) with
V , V  , X , or {}.
Note that the error  % !! can mean
„ you explicitly (from the keyboard) called a program
label that does not exist; or
„ the program that you called referred to another
label, which does not exist.
   The catalog of programs ( { Y { } )
indicates no program labels stored.
 !  SOLVE cannot find the root of the equation using the
current initial guesses (see page D–8). A SOLVE
operation executed in a program does not produce this
error; the same condition causes it instead to skip the
next program line (the line following the instruction
# variable).
#  $ Warning (displayed momentarily); the magnitude of a
result is too large for the calculator to handle. The
calculator returns ±9.99999999999E499 in the
current display format. (See "Range of Numbers and
Overflow" on page 1–16.) This condition sets flag 6. If
flag 5 is set, overflow has the added effect of halting a
running program and leaving the message in the
display until you press a key.
 !  Indicates the "top" of program memory. The memory
scheme is circular, so  ! is also the "line"
after the last line in program memory.
!  Attempted to execute # variable or ³  d
variable without a selected program label. This can
happen only the first time that you use SOLVE or
³ FN
after the message  &  , or it can happen
if the current label no longer exists.
# !# A running program attempted to select a program
label (/label) while a SOLVE operation was
running.
#1 #2 A running program attempted to solve a program while
a SOLVE operation was running.
#1 ³ 2 A running program attempted to integrate a program
while a SOLVE operation was running.