GDB does not find simbols

[Nacho Sanmillan]

Whenever i try any of the unmask_jemalloc commands I get errors such as:

(gdb) jearenas
[unmask_jemalloc] parsing structures from memory...
[unmask_jemalloc] error: cannot evaluate arenas[%d]
Python Exception <class 'TypeError'> unsupported operand type(s) for %: 'NoneType' and 'int':
Error occurred in Python command: unsupported operand type(s) for %: 'NoneType' and 'int'
(gdb)

Any Idea why?. I tried to link the static library's simbols, but still cannot find the ones that it needs.

Regards