Error making binary JSON for a matlab structure about jsonlab HOT 1 CLOSED

>> load testubj
>> gp

gp = 

  struct with fields:

       fitness: [1×1 struct]
         genes: [1×1 struct]
          info: [1×1 struct]
         nodes: [1×1 struct]
     operators: [1×1 struct]
    runcontrol: [1×1 struct]
     selection: [1×1 struct]
       treedef: [1×1 struct]
      userdata: [1×1 struct]

>> savebj('',gp)

ans =

    '{U�fitness{U�ArchiveTypeU�U�Complexity_WeightU�U	NL_weightU�U�aboutSU�Fitness-objective functionU
     complexityMaxuô�U�complexityMeasureU�U�labelSU�FitnessUminimisationTU�nonlinearityMaxU U�nonlinearityMeasureU�U
     paretoMeasureU�U	terminateFU�terminate_valueD      ðÿypredMaxD      ð�ypredMinD      ðÿ}U�genes{U�aboutSU	MultigeneU	max_genesU�U	multigeneTU	operators{U
     p_cross_hiD������É?U
     hi_cross_rateD      à?}}U�info{U�duplicatesRemovedTfilteredFU
     lastFilterZU�mergedFU�mergedPopSizesZU�versionSU�testUversion_dateSU�28-Mar-2022}U�nodes{U�aboutSU�Node configurationU�const{U�aboutSU�Ephemeral random constantsU�num_dec_placesU�U�p_ERCD������¹?U�p_intU U�range[$i#U�ö
     }U	functions{U�aboutSU�Function nodesU�activeZU�arityZU�name[SU�timesSU�minusSU�plusSU�rdivideSU�squareSU�shiftSU�scaleSU�negSU�invertSU�power]UuseProtectedU U�userealU�U�userealname[SU�shiftSU�scaleSU�power]}U�inputs{U�num_inpZU�namesZ}U�output{U�nameCy}}U	operators{U�aboutSU�Genetic operatorsU�branchSizeLimitU U	crossover{U�p_crossDffffffæ?}U�directrepro{p_directD{�®Gáz�?}mutation{gaussian{U�std_devD������¹?}U
     mutate_par[$D#U�ffffffæ?������É?������©?������©?                        p_mutateDìQ¸��ëÑ?}}U
     runcontrol{U�aboutSU�Run controlU�num_casU�U�num_genU2parallel{U�autoTU�enableTU�okFU
     numWorkersU autosizeT}pop_sizeUdU�quietTU�runsU�savefreqU U�showBestInputsFU�showValBestInputsFU�suppressConfigTU�timeoutD      ð�usecacheTU�verboseU
     U
     usearchiveU�U�optiarchiveU�U�archiveSizeLimitU U�PlotRunT}U	selection{U�aboutSU	SelectionU�elite_fractionD333333Ã?U
     tournament{U�sizeU�U�sizearchiveU�Ulex_pressureTp_paretoU }}U�treedef{U�aboutSU
     Tree buildingUbuild_methodU�U	max_depthUU�max_mutate_depthU�U	max_nodesD      ð�}userdata{U
     bootSampleFU�nameSMymodelsU
     showgraphsU�U�statsTuser_fcnZ}}'

>> a=loadbj(savebj('',gp))

a = 

  struct with fields:

       fitness: [1×1 struct]
         genes: [1×1 struct]
          info: [1×1 struct]
         nodes: [1×1 struct]
     operators: [1×1 struct]
    runcontrol: [1×1 struct]
     selection: [1×1 struct]
       treedef: [1×1 struct]
      userdata: [1×1 struct]