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there is no file like "logs" in minecraft because there is no problem with that, there is problem with forge maybe i dont know, it do not generate any log -.-As said : open your own thread and post correct full logs <your FTB-folder>/direwolf20_17/minecraft/logs/fml-client-latest.log and <your FTB-folder>/direwolf20_17/minecraft/logs/latest.log.
If the launcher fails to set-up the pack look in the folder where your launcher is located. You should find 2 log-files named "FTBLauncherLog.txt" and "MinecraftLog.txt". The needed information should be in the "FTBLauncherLog.txt" file.
Also : your screenshot shows you are using launcher 1.4.3. Update it to launcher 1.4.4 or 1.4.5 be downloading newest launcher from main-page.
Well : as shown in the screenshot shown there is only the output "NullPointerException". The StackTrace is only logged into the file. This is just how log4j works.It is usually the log from the console that is required.