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Error when trying to use the library

See original GitHub issue

The library looks fantastic and I would like to use it. I added the following to the build.gradle

implementation 'com.github.skydoves:powermenu:2.0.3

on onCreate I have the following code -

         powerMenu = new PowerMenu.Builder(this)
                .addItem(new PowerMenuItem("Settings", false))
                .addItem(new PowerMenuItem("Travel", false))
                .addItem(new PowerMenuItem("Logout", false))
                .setAnimation(MenuAnimation.SHOWUP_TOP_LEFT) // Animation start point (TOP | LEFT)
                .setMenuRadius(0f)
                .setMenuShadow(0f)
                .setTextColor(Color.BLACK)
                .setSelectedTextColor(Color.WHITE)
                .setMenuColor(Color.WHITE)
                .setSelectedMenuColor(Color.BLACK)
                .setOnMenuItemClickListener(new OnMenuItemClickListener<PowerMenuItem>() {
                    @Override
                    public void onItemClick(int position, PowerMenuItem item) {
                        Toast.makeText(getBaseContext(), item.getTitle(), Toast.LENGTH_SHORT).show();
                    }
                })
                .build();

        mMenuButton = (Button)findViewById(R.id.floating_menu_context);
        mMenuButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                powerMenu.showAsDropDown(view);
            }
        });

I get the following error :

Error:(339, 26) error: cannot access LifecycleObserver class file for android.arch.lifecycle.LifecycleObserver not found

any help ? thanks !