Accu-Chek performa Owner's Booklet page 66

The test strip is damaged.
Remove the test strip and
reinsert it, or replace it if
damaged. Verify that the
code number on the test
strip container matches the
code number printed on the
code chip currently inserted in the meter. If
the message reappears, call Roche.
The code chip is incorrect.
Turn off the meter and insert
a new code chip. If this does
not fix the problem, call
Roche.
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Your blood glucose may be
extremely high or a meter
or a test strip error has
occurred. If this confirms
how you feel, contact your
healthcare professional
immediately. If it does
not confirm how you feel,
repeat the test and refer to Chapter 2
"Unusual Test Results". If this does not
confirm the way you feel, run a control
test with your control solution and a new
test strip. If the control result is within the
acceptable range, review the proper testing
procedure and repeat your blood glucose
test with a new test strip. If the E-3 code
still appears for your blood glucose test,
your blood glucose result may be extremely
high and above the system's reading range.
Contact your healthcare professional
immediately. If the control result is not
within the acceptable range, see Chapter 4
"Understanding Control Test Results".