YOU SAID:
The documentation of this application is incomprehensible
INTO JAPANESE
このアプリケーションのドキュメントは理解できない
BACK INTO ENGLISH
I can't understand the documentation for this application
INTO JAPANESE
このアプリケーションのドキュメントを理解できません
BACK INTO ENGLISH
I can't understand the documentation for this application
Come on, you can do better than that.