zero cross section / Cross section not calculated in dim6Top_UFO model

Hi, I tried using the dim6Top_UFO model to generate p p > t z and subsequent decays, the process were generated but upon launch, it gives two errors, I am somewhat of a noob in this so I'd appreciate if you can point out where the issue is.

here is the launch sequence code where warnings were present:
INFO: Update the dependent parameter of the param_card.dat
Generating 10000 events with run name run_01
survey run_01
INFO: compile directory
compile Source Directory
ATTENTION: default value of option mesa_glthread overridden by environment.
ATTENTION: default value of option mesa_glthread overridden by environment.
ATTENTION: default value of option mesa_glthread overridden by environment.
ATTENTION: default value of option mesa_glthread overridden by environment.
Using random number seed offset = 21
INFO: Running Survey
Creating Jobs
Working on SubProcesses
INFO: Compiling for process 1/8.
INFO: P0_gq_tll_t_wpb_wp_lvl
WARNING: The optimizer detects that you have coupling evaluated to zero:
GC_940 GC_942 GC_944 GC_946 GC_949 GC_950 GC_951 GC_952 GC_98 GC_99 GC_100 GC_101 GC_102 GC_103 GC_104 GC_105 GC_106 GC_107 GC_108 GC_109 GC_125 GC_127 GC_129 GC_131 GC_133 GC_135 GC_137 GC_139 GC_141 GC_143 GC_145 GC_147 GC_319 GC_320 GC_321 GC_322 GC_323 GC_324 GC_325 GC_326 GC_327 GC_328 GC_329 GC_330 GC_355 GC_356 GC_357 GC_358 GC_361 GC_362 GC_363 GC_364 GC_365 GC_366 GC_369 GC_370 GC_371 GC_372 GC_373 GC_374 GC_377 GC_378 GC_379 GC_380 GC_381 GC_382 GC_385 GC_386 GC_387 GC_388 GC_389 GC_390 GC_393 GC_394 GC_395 GC_396 GC_397 GC_398 GC_401 GC_402 GC_403 GC_404 GC_405 GC_406 GC_409 GC_410 GC_411 GC_412 GC_413 GC_414 GC_417 GC_418 GC_419 GC_420 GC_421 GC_422 GC_425 GC_426 GC_427 GC_428 GC_429 GC_430 GC_433 GC_434 GC_435 GC_436 GC_437 GC_438 GC_441 GC_442 GC_443 GC_444 GC_445 GC_446 GC_449 GC_450 GC_451 GC_452 GC_453 GC_454 GC_455 GC_456 GC_457 GC_458 GC_459 GC_460 GC_461 GC_462 GC_751 GC_752 GC_753 GC_754 GC_755 GC_756 GC_757 GC_758 GC_769 GC_770 GC_771 GC_772 GC_773 GC_774 GC_775 GC_776 GC_797 GC_798 GC_799 GC_800 GC_801 GC_802 GC_803 GC_804
This will slow down the computation. Please consider using restricted model:
https://answers.launchpad.net/mg5amcnlo/+faq/2312
INFO: Compiling for process 2/8.
INFO: P0_gq_tll_t_wpb_wp_tapvl
INFO: Compiling for process 3/8.
INFO: P0_gq_ttaptam_t_wpb_wp_lvl
INFO: Compiling for process 4/8.
INFO: P0_gq_ttaptam_t_wpb_wp_tapvl
INFO: Compiling for process 5/8.
INFO: P1_gq_txll_tx_wmbx_wm_lvl
INFO: Compiling for process 6/8.
INFO: P1_gq_txll_tx_wmbx_wm_tamvl
INFO: Compiling for process 7/8.
INFO: P1_gq_txtaptam_tx_wmbx_wm_lvl
INFO: Compiling for process 8/8.
INFO: P1_gq_txtaptam_tx_wmbx_wm_tamvl
INFO: P0_gq_tll_t_wpb_wp_lvl
INFO: P0_gq_tll_t_wpb_wp_tapvl
INFO: P0_gq_ttaptam_t_wpb_wp_lvl
INFO: P0_gq_ttaptam_t_wpb_wp_tapvl
INFO: P1_gq_txll_tx_wmbx_wm_lvl
INFO: P1_gq_txll_tx_wmbx_wm_tamvl
INFO: P1_gq_txtaptam_tx_wmbx_wm_lvl
INFO: P1_gq_txtaptam_tx_wmbx_wm_tamvl
INFO: Idle: 60, Running: 8, Completed: 36 [ current time: 19h56 ]
INFO: Idle: 59, Running: 8, Completed: 37 [ 43.2s ]
INFO: Idle: 45, Running: 8, Completed: 51 [ 46.5s ]
INFO: Idle: 37, Running: 8, Completed: 59 [ 49.5s ]
INFO: Idle: 28, Running: 8, Completed: 68 [ 52.9s ]
INFO: Idle: 24, Running: 8, Completed: 72 [ 59.6s ]
INFO: Idle: 20, Running: 8, Completed: 76 [ 1m 5s ]
INFO: Idle: 13, Running: 8, Completed: 83 [ 1m 8s ]
INFO: Idle: 11, Running: 8, Completed: 85 [ 1m 16s ]
INFO: Idle: 7, Running: 8, Completed: 89 [ 1m 46s ]
INFO: Idle: 0, Running: 8, Completed: 96 [ 1m 49s ]
INFO: Idle: 0, Running: 6, Completed: 98 [ 1m 52s ]
INFO: Idle: 0, Running: 5, Completed: 99 [ 1m 56s ]
INFO: Idle: 0, Running: 1, Completed: 103 [ 2m 0s ]
INFO: Idle: 0, Running: 0, Completed: 104 [ 2m 1s ]
INFO: End survey
refine 10000
Creating Jobs
INFO: Refine results to 10000
INFO: Generating 10000.0 unweighted events.
sum of cpu time of last step: 16m14s
INFO: Effective Luminosity 1.2e+103 pb^-1
INFO: need to improve 0 channels
Survey return zero cross section.
   Typical reasons are the following:
   1) A massive s-channel particle has a width set to zero.
   2) The pdf are zero for at least one of the initial state particles
      or you are using maxjetflavor=4 for initial state b:s.
   3) The cuts are too strong.
   Please check/correct your param_card and/or your run_card.
Zero result detected: See https://cp3.irmp.ucl.ac.be/projects/madgraph/wiki/FAQ-General-14
INFO:
quit
INFO:
more information in /home/abdullah/MG5_aMC_v3_1_1/tZq_signal_dim/index.html

let me know if there is anything you require to answer it better, also can you recommend a link where I can read up on models and what do the parameters inside them represent physically?
regards