Also when I press on quest journal, when I click on quest details it becomes a black page on the right as the attached photo. Therefore, I can't see the quest details and I'm stuck don'know how to active the bomb or move it to the rocks? Please help, I've been trying for 3 days without any success. 
I've seen some scattered reports of black screens; I'm not entirely sure what's causing it. My present theory is that it's something to do with wonky WebGL support on your device. You may be able to edit the package.json file (in the same folder as the rest of the game data) to fix it. Inside the empty quotes beside "chromium-args" try adding: --disable-webgl
This will force the game to play in canvas mode, which may give worse performance overall, but I think it may help the issue you're describing.