cartesian_ddg error: “Assertion `files.size() == 1` failed.”

I am trying to run the cartesian_ddg protocol (https://www.rosettacommons.org/docs/latest/cartesian-ddG).

I am using the following command:

cartesian_ddg.static.linuxgccrelease 

-database $ROSETTADB 

-s min_2b5i-A_0001_clean_0011.pdb 

–ddg:mut_file themutfile.txt  

-ddg:iterations 3 

-ddg::cartesian 

-ddg::dump_pdbs false 

-bbnbr 1 

-fa_max_dis 9.0 

-beta_cart

where $ROSETTADB points to the database directory. I am attaching the .pdb and mutfile.

I am getting the following error:

Using mutfile: themutfile.txt

core.init: Rosetta version: rosetta.binary.linux.release-171 r171 2018.09+release.333d996 333d99699777cd6a50d1c1736bacd689f8f1d1df https://www.rosettacommons.org 2018-02-27T09:57:00.705373

core.init: command: cartesian_ddg.static.linuxgccrelease -database /home/cossio/apps/rosetta_bin_linux_2018.09.60072_bundle/main/database -s min_2b5i-A_0001_clean_0011.pdb –ddg:mut_file themutfile.txt -ddg:iterations 3 -ddg::cartesian -ddg::dump_pdbs false -bbnbr 1 -fa_max_dis 9.0 -beta_cart

core.init: 'RNG device' seed mode, using '/dev/urandom', seed=-2080023677 seed_offset=0 real_seed=-2080023677

core.init.random: RandomGenerator:init: Normal mode, seed=-2080023677 RG_type=mt19937



ERROR: Assertion `files.size() == 1` failed.

ERROR:: Exit from: src/basic/options/util.cc line: 49

BACKTRACE:

[0x58ccf98]

[0x5566c4a]

[0x4110dd]

[0x5e12cf4]

[0x61855d]

caught exception



File: src/basic/options/util.cc:49

[ ERROR ] UtilityExitException

ERROR: Assertion `files.size() == 1` failed.