Issue an error message if TTF was not initialized correctly and we can not call its member functions.
Issue an error message if TTF was not initialized correctly and we can not call its member functions.

alexschlueter/cern-root,Y--/root,root-mirror/root,smarinac/root,perovic/root,mattkretz/root,lgiommi/root,dfunke/root,nilqed/root,vukasinmilosevic/root,perovic/root,agarciamontoro/root,bbockelm/root,abhinavmoudgil95/root,perovic/root,sirinath/root,beniz/root,sbinet/cxx-root,abhinavmoudgil95/root,krafczyk/root,karies/root,omazapa/root,esakellari/root,arch1tect0r/root,esakellari/root,buuck/root,omazapa/root,georgtroska/root,gbitzes/root,BerserkerTroll/root,0x0all/ROOT,Duraznos/root,Y--/root,CristinaCristescu/root,dfunke/root,veprbl/root,satyarth934/root,root-mirror/root,esakellari/root,gbitzes/root,BerserkerTroll/root,omazapa/root-old,BerserkerTroll/root,0x0all/ROOT,Duraznos/root,Y--/root,abhinavmoudgil95/root,zzxuanyuan/root,buuck/root,veprbl/root,root-mirror/root,lgiommi/root,zzxuanyuan/root-compressor-dummy,karies/root,agarciamontoro/root,esakellari/my_root_for_test,evgeny-boger/root,perovic/root,sawenzel/root,zzxuanyuan/root-compressor-dummy,omazapa/root,smarinac/root,omazapa/root,satyarth934/root,esakellari/root,CristinaCristescu/root,georgtroska/root,alexschlueter/cern-root,zzxuanyuan/root-compressor-dummy,mkret2/root,perovic/root,zzxuanyuan/root-compressor-dummy,sbinet/cxx-root,pspe/root,bbockelm/root,veprbl/root,abhinavmoudgil95/root,arch1tect0r/root,arch1tect0r/root,omazapa/root-old,mkret2/root,root-mirror/root,zzxuanyuan/root-compressor-dummy,gganis/root,perovic/root,nilqed/root,dfunke/root,georgtroska/root,lgiommi/root,gganis/root,mattkretz/root,vukasinmilosevic/root,davidlt/root,beniz/root,BerserkerTroll/root,jrtomps/root,CristinaCristescu/root,simonpf/root,davidlt/root,gganis/root,satyarth934/root,gganis/root,lgiommi/root,thomaskeck/root,mkret2/root,beniz/root,sbinet/cxx-root,beniz/root,lgiommi/root,sawenzel/root,dfunke/root,georgtroska/root,zzxuanyuan/root,gbitzes/root,gbitzes/root,karies/root,beniz/root,davidlt/root,sawenzel/root,mkret2/root,satyarth934/root,veprbl/root,arch1tect0r/root,0x0all/ROOT,mkret2/root,Y--/root,Y--/root,esakellari/root,abhinavmoudgil95/root,zzxuanyuan/root-compressor-dummy,smarinac/root,mhuwiler/rootauto,CristinaCristescu/root,evgeny-boger/root,bbockelm/root,omazapa/root,sawenzel/root,arch1tect0r/root,nilqed/root,smarinac/root,mattkretz/root,evgeny-boger/root,mhuwiler/rootauto,sirinath/root,nilqed/root,veprbl/root,sirinath/root,sawenzel/root,buuck/root,dfunke/root,thomaskeck/root,bbockelm/root,evgeny-boger/root,esakellari/my_root_for_test,gbitzes/root,Duraznos/root,esakellari/my_root_for_test,BerserkerTroll/root,lgiommi/root,krafczyk/root,gganis/root,pspe/root,davidlt/root,smarinac/root,mattkretz/root,abhinavmoudgil95/root,georgtroska/root,sawenzel/root,evgeny-boger/root,alexschlueter/cern-root,mhuwiler/rootauto,buuck/root,agarciamontoro/root,omazapa/root-old,bbockelm/root,BerserkerTroll/root,mhuwiler/rootauto,pspe/root,sirinath/root,perovic/root,simonpf/root,agarciamontoro/root,0x0all/ROOT,omazapa/root-old,sawenzel/root,veprbl/root,Y--/root,gganis/root,veprbl/root,gganis/root,krafczyk/root,olifre/root,abhinavmoudgil95/root,zzxuanyuan/root-compressor-dummy,mkret2/root,krafczyk/root,smarinac/root,esakellari/root,cxx-hep/root-cern,mhuwiler/rootauto,georgtroska/root,lgiommi/root,sbinet/cxx-root,esakellari/root,zzxuanyuan/root,krafczyk/root,thomaskeck/root,zzxuanyuan/root,agarciamontoro/root,mattkretz/root,satyarth934/root,sirinath/root,omazapa/root-old,gbitzes/root,thomaskeck/root,sawenzel/root,agarciamontoro/root,vukasinmilosevic/root,vukasinmilosevic/root,buuck/root,simonpf/root,perovic/root,mattkretz/root,georgtroska/root,esakellari/root,nilqed/root,lgiommi/root,zzxuanyuan/root,root-mirror/root,abhinavmoudgil95/root,buuck/root,olifre/root,jrtomps/root,beniz/root,smarinac/root,karies/root,jrtomps/root,zzxuanyuan/root,dfunke/root,krafczyk/root,olifre/root,CristinaCristescu/root,pspe/root,0x0all/ROOT,esakellari/root,mattkretz/root,zzxuanyuan/root-compressor-dummy,davidlt/root,beniz/root,omazapa/root-old,abhinavmoudgil95/root,mhuwiler/rootauto,omazapa/root,olifre/root,sawenzel/root,olifre/root,davidlt/root,beniz/root,evgeny-boger/root,perovic/root,mattkretz/root,cxx-hep/root-cern,gganis/root,sbinet/cxx-root,mkret2/root,BerserkerTroll/root,esakellari/root,evgeny-boger/root,esakellari/root,omazapa/root-old,krafczyk/root,simonpf/root,root-mirror/root,gbitzes/root,thomaskeck/root,gbitzes/root,zzxuanyuan/root-compressor-dummy,0x0all/ROOT,bbockelm/root,simonpf/root,sbinet/cxx-root,arch1tect0r/root,CristinaCristescu/root,pspe/root,mkret2/root,jrtomps/root,zzxuanyuan/root-compressor-dummy,vukasinmilosevic/root,Duraznos/root,vukasinmilosevic/root,buuck/root,BerserkerTroll/root,CristinaCristescu/root,olifre/root,zzxuanyuan/root,pspe/root,Duraznos/root,arch1tect0r/root,nilqed/root,jrtomps/root,georgtroska/root,root-mirror/root,root-mirror/root,Y--/root,sirinath/root,lgiommi/root,omazapa/root-old,veprbl/root,sbinet/cxx-root,pspe/root,davidlt/root,olifre/root,bbockelm/root,zzxuanyuan/root,mkret2/root,jrtomps/root,cxx-hep/root-cern,mattkretz/root,davidlt/root,Y--/root,buuck/root,dfunke/root,satyarth934/root,esakellari/my_root_for_test,cxx-hep/root-cern,pspe/root,esakellari/my_root_for_test,olifre/root,krafczyk/root,mhuwiler/rootauto,zzxuanyuan/root,vukasinmilosevic/root,cxx-hep/root-cern,simonpf/root,agarciamontoro/root,zzxuanyuan/root,Duraznos/root,beniz/root,sbinet/cxx-root,omazapa/root,davidlt/root,sirinath/root,BerserkerTroll/root,omazapa/root,thomaskeck/root,0x0all/ROOT,bbockelm/root,jrtomps/root,pspe/root,lgiommi/root,nilqed/root,omazapa/root,bbockelm/root,karies/root,olifre/root,lgiommi/root,gganis/root,mhuwiler/rootauto,veprbl/root,jrtomps/root,alexschlueter/cern-root,evgeny-boger/root,veprbl/root,root-mirror/root,sbinet/cxx-root,cxx-hep/root-cern,smarinac/root,simonpf/root,simonpf/root,Y--/root,karies/root,vukasinmilosevic/root,mhuwiler/rootauto,vukasinmilosevic/root,agarciamontoro/root,arch1tect0r/root,root-mirror/root,bbockelm/root,pspe/root,veprbl/root,thomaskeck/root,gbitzes/root,perovic/root,sirinath/root,karies/root,jrtomps/root,esakellari/my_root_for_test,omazapa/root-old,simonpf/root,omazapa/root,Duraznos/root,Duraznos/root,satyarth934/root,karies/root,buuck/root,alexschlueter/cern-root,zzxuanyuan/root-compressor-dummy,olifre/root,sawenzel/root,jrtomps/root,zzxuanyuan/root,thomaskeck/root,omazapa/root-old,alexschlueter/cern-root,dfunke/root,buuck/root,vukasinmilosevic/root,bbockelm/root,root-mirror/root,karies/root,Y--/root,alexschlueter/cern-root,mkret2/root,BerserkerTroll/root,0x0all/ROOT,krafczyk/root,smarinac/root,satyarth934/root,Duraznos/root,CristinaCristescu/root,cxx-hep/root-cern,krafczyk/root,esakellari/my_root_for_test,sbinet/cxx-root,sirinath/root,gganis/root,nilqed/root,agarciamontoro/root,Y--/root,evgeny-boger/root,olifre/root,omazapa/root,gbitzes/root,jrtomps/root,0x0all/ROOT,sbinet/cxx-root,dfunke/root,simonpf/root,pspe/root,thomaskeck/root,evgeny-boger/root,Duraznos/root,arch1tect0r/root,CristinaCristescu/root,vukasinmilosevic/root,cxx-hep/root-cern,agarciamontoro/root,agarciamontoro/root,evgeny-boger/root,beniz/root,thomaskeck/root,omazapa/root-old,abhinavmoudgil95/root,arch1tect0r/root,buuck/root,davidlt/root,perovic/root,mattkretz/root,gganis/root,georgtroska/root,sirinath/root,CristinaCristescu/root,satyarth934/root,mattkretz/root,nilqed/root,smarinac/root,gbitzes/root,BerserkerTroll/root,georgtroska/root,mhuwiler/rootauto,krafczyk/root,satyarth934/root,sawenzel/root,esakellari/my_root_for_test,arch1tect0r/root,esakellari/my_root_for_test,davidlt/root,zzxuanyuan/root,dfunke/root,nilqed/root,abhinavmoudgil95/root,Duraznos/root,simonpf/root,sirinath/root,mkret2/root,esakellari/my_root_for_test,karies/root,georgtroska/root,nilqed/root,mhuwiler/rootauto,karies/root,beniz/root,dfunke/root,satyarth934/root,CristinaCristescu/root