ACEX Sitting addon not detected

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I am trying to get a mission on my server working (ubuntu server 17.10). But if i'm starting the server it shows up with:

 

20:08:31 Reading mission ...
20:08:31 Starting mission:
20:08:31  Mission file: sniper_training (__cur_mp)
20:08:31  Mission world: Altis
20:08:31  Mission directory: mpmissions\__cur_mp.Altis\
20:08:31 You cannot play/edit this mission; it is dependent on downloadable content that has been deleted.acex_sitting
20:08:31 Mission Precision Training 1st B-L read from bank.
20:08:31 Missing addons detected:
20:08:31   acex_sitting

and loops it until I stop the server.

 

Here a screenshot of the acex_sitting.pbo file location: http://prntscr.com/htx9aq

 

start.sh:

#!/bin/bash

./arma3server -config="server.cfg" -mod="mods/@ace;mods/@ACE_Compat_RHS_Armed_Forces_of_the_Russian_Federation;mods/@ACE_Compat_RHS_United_States_Armed_Forces;mods/@Advanced_Towing;mods/@Advanced_Urban_Rappelling;mods/@AdvancedSlingLoading;mods/@ASR_AI3;mods/@BackpackOnChest;mods/@CBA_A3;mods/@Enhanced_Movement;mods/@Foxhound_Siberian_Guard;mods/@RHSAFRF;mods/@RHSUSAF;mods/@Specialist_Military_Arms_SMA_Version_2.7.1;mods/@task_force_radio;mods/@TFT8_Uniforms;mods/@TRYK;mods/@Winter_2035;mods/@JSRS_SOUNDMOD;mods/@JSRS4_APEX1.2;mods/@JSRS_SOUNDMOD_RHS_USAF_Mod_Pack_Sound_Support;mods/@JSRS_SOUNDMOD_RHS_AFRF_Mod_Pack_Sound_Support;mods/@JSRS SOUNDMOD_Additional_Weapon_Handling_and_Reloading;mods/@Enhanced_Soundscape;mods/@Blastcore_Edited;mods/@JSRS_SOUNDMOD_Specialist_Military_Arms_Mod_Sound_Support;mods/@C17;mods/@ACEX;mods/@F16;mods/@FIR_AWS" -autoInit

i just can't find out what the problem is please help!