The exit code and message of the Pede executable can be found in the file millepede.end :

-1 Still running or crashed
00 Ended normally
01 Ended with warnings (bad measurements)
02 Ended with severe warnings (insufficient measurements)
03 Ended with severe warnings (bad global matrix)
04 Ended with severe warnings (bad binary file(s))
05 Ended without solution (empty constraints)
10 Aborted, no steering file
11 Aborted, open error for steering file
12 Aborted, second text file in command line
13 Aborted, unknown keywords in steering file
14 Aborted, no binary files
15 Aborted, open error(s) for binary files
16 Aborted, open error(s) for text files
17 Aborted, file name too long
18 Aborted, read error(s) for binary files
19 Aborted, binary file(s) modified
20 Aborted, bad binary records
21 Aborted, no labels/parameters defined
22 Aborted, no variable global parameters
23 Aborted, bad matrix index
24 Aborted, vector/matrix size mismatch
25 Aborted, result vector contains NaNs
26 Aborted, too many rejects
27 Aborted, singular QL decomposition of constraints matrix
28 Aborted, no local parameters
29 Aborted, factorization of global matrix failed
30 Aborted, memory allocation failed
31 Aborted, memory deallocation failed
32 Aborted, iteration limit reached in diagonalization
33 Aborted, stack overflow in quicksort
34 Aborted, pattern string too long - obsolete
35 Aborted, mismatch of number of global parameters
40 Aborted, other errors