Reading symbols from /home/exp/FOT/poppler/build/install/bin/pdfunite...done.
Starting program: /home/exp/FOT/poppler/build/install/bin/pdfunite sigabrt_Object.h:258_1.pdf sigabrt_Object.h:258_2.pdf /tmp/out.pdf
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Syntax Error: Couldn't find trailer dictionary
Syntax Error: Couldn't find trailer dictionary
Syntax Error (374): Illegal character <10> in hex string
Syntax Error (603): Dictionary key must be a name object
Syntax Error (605): Dictionary key must be a name object
Syntax Error (611): Dictionary key must be a name object
Syntax Error: Failed to parse XRef entry [3].
Internal Error: xref num 3 not found but needed, try to reconstruct<0a>
Syntax Error: Couldn't find trailer dictionary
Syntax Error: Invalid XRef entry 21
Internal Error: xref num 21 not found but needed, try to reconstruct<0a>
Syntax Error: Invalid XRef entry 21
Syntax Error: Couldn't find trailer dictionary
Internal Error (0): Call to Object where the object was type 5, not the expected type 7

Program received signal SIGABRT, Aborted.
__GI_raise (sig=sig@entry=0x6) at ../sysdeps/unix/sysv/linux/raise.c:51
51	../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
#0  __GI_raise (sig=sig@entry=0x6) at ../sysdeps/unix/sysv/linux/raise.c:51
#1  0x00007ffff5f3a801 in __GI_abort () at abort.c:79
#2  0x000000000051e117 in Object::getDict (this=0x7fffffffbd70) at ../poppler/Object.h:258
#3  main (argc=<optimized out>, argv=<optimized out>) at ../utils/pdfunite.cc:205