I am having issue with the LHAPDF, In the pythia8, I have installed LHAPDF6, which was installed default. fail Failed to access python version of LHAPDF: If the python interface to LHAPDF is available on your system, try adding its location to f

fail
Failed to access python version of LHAPDF: If the python interface to LHAPDF is available on your system, try adding its location to the PYTHONPATH environment variable and theLHAPDF library location to LD_LIBRARY_PATH (linux) or DYLD_LIBRARY_PATH

MG5_aMC>launch pt
************************************************************
* *
* W E L C O M E to *
* M A D G R A P H 5 _ a M C @ N L O *
* M A D E V E N T *
* *
* * * *
* * * * * *
* * * * * 5 * * * * *
* * * * * *
* * * *
* *
* VERSION 2.6.4 2018-11-09 *
* *
* The MadGraph5_aMC@NLO Development Team - Find us at *
* https://server06.fynu.ucl.ac.be/projects/madgraph *
* *
* Type 'help' for in-line help. *
* *
************************************************************
INFO: load configuration from /home/kanhaiya/Madgraph/MG5_aMC_v2_5_5/pt/Cards/me5_configuration.txt
INFO: load configuration from /home/kanhaiya/Madgraph/MG5_aMC_v2_5_5/input/mg5_configuration.txt
INFO: load configuration from /home/kanhaiya/Madgraph/MG5_aMC_v2_5_5/pt/Cards/me5_configuration.txt
Using default text editor "vi". Set another one in ./input/mg5_configuration.txt
generate_events run_04
The following switches determine which programs are run:
/==============================================================================\
| 1. Choose the shower/hadronization program shower = Pythia8 |
| 2. Choose the detector simulation program detector = Delphes |
| 3. Choose an analysis package (plot/convert) analysis = MadAnalysis4 |
| 4. Decay onshell particles madspin = OFF |
| 5. Add weights to events for new hypp. reweight = OFF |
\==============================================================================/
Either type the switch number (1 to 5) to change its setting,
Set any switch explicitly (e.g. type 'shower=OFF' at the prompt)
Type 'help' for the list of all valid option
Type '0', 'auto', 'done' or just press enter when you are done.[60s to answer]
>0
Do you want to edit a card (press enter to bypass editing)?
/------------------------------------------------------------\
| 1. param : param_card.dat |
| 2. run : run_card.dat |
| 3. pythia8 : pythia8_card.dat |
| 4. delphes : delphes_card.dat |
| 5. plot : plot_card.dat |
\------------------------------------------------------------/
 you can also
   - enter the path to a valid card or banner.
   - use the 'set' command to modify a parameter directly.
     The set option works only for param_card and run_card.
     Type 'help set' for more information on this command.
   - call an external program (ASperGE/MadWidth/...).
     Type 'help' for the list of available command
 [0, done, 1, param, 2, run, 3, pythia8, 4, enter path, ... ][90s to answer]
>0
INFO: Update the dependent parameter of the param_card.dat
Generating 10000 events with run name run_04
survey run_04
INFO: compile directory
compile Source Directory
Using random number seed offset = 48
INFO: Running Survey
Creating Jobs
Working on SubProcesses
INFO: P1_gg_ttx
INFO: P1_qq_ttx
INFO: Idle: 0, Running: 1, Completed: 1 [ current time: 19h42 ]
INFO: Idle: 0, Running: 0, Completed: 2 [ 0.47s ]
INFO: Idle: 0, Running: 0, Completed: 2 [ 0.47s ]
INFO: End survey
refine 10000
Creating Jobs
INFO: Refine results to 10000
INFO: Generating 10000.0 unweigthed events.
INFO: Effective Luminosity 23.8342565797 pb^-1
INFO: need to improve 3 channels
Current estimate of cross-section: 503.477 +- 2.655881668
    P1_gg_ttx
    P1_qq_ttx
INFO: Idle: 10, Running: 4, Completed: 0 [ current time: 19h42 ]
INFO: Idle: 5, Running: 4, Completed: 5 [ 3.4s ]
INFO: Idle: 0, Running: 0, Completed: 14 [ 5.8s ]
INFO: Combining runs
INFO: finish refine
refine 10000
Creating Jobs
INFO: Refine results to 10000
INFO: Generating 10000.0 unweigthed events.
INFO: Effective Luminosity 23.7595533204 pb^-1
INFO: need to improve 0 channels
Current estimate of cross-section: 505.06 +- 0.733849537031
    P1_gg_ttx
    P1_qq_ttx
INFO: Idle: 0, Running: 0, Completed: 0 [ current time: 19h42 ]
INFO: Combining runs
INFO: finish refine
INFO: Combining Events
  === Results Summary for run: run_04 tag: tag_1 ===

     Cross-section : 505.1 +- 0.7338 pb
     Nb of events : 10000

fail
Failed to access python version of LHAPDF: If the python interface to LHAPDF is available on your system, try adding its location to the PYTHONPATH environment variable and theLHAPDF library location to LD_LIBRARY_PATH (linux) or DYLD_LIBRARY_PATH (mac os x).
INFO: can not run systematics since can not link python to lhapdf
INFO: Creating Plots for parton level
INFO: Plots for parton level generated, see /home/kanhaiya/Madgraph/MG5_aMC_v2_5_5/pt/HTML/run_04/plots_parton.html
INFO: End Plots for parton level
store_events
INFO: Storing parton level results
INFO: End Parton
reweight -from_cards
decay_events -from_cards
INFO: Running Pythia8 [arXiv:1410.3012]
Splitting .lhe event file for PY8 parallelization...
Submitting Pythia8 jobs...
Pythia8 shower jobs: 0 Idle, 4 Running, 0 Done [4 seconds]