FarmVille 2 Country Escape on my iPad crashes after it opens. What can I do?

if the hard drive is the fault , any computer / IT repair shop can fit a new one

You need to go to the App store and into the updates section. Where your app is listed either choose "install", "update" or "update all"

Try to clear cache or cache partition.

If you have previously backed up your iPad, you can

• connect your iPad to your computer,
• open iTunes
• select your iPad
• in the Summary screen, press the "Restore Backup" button

After several minutes, your backup will be complete and your previous data restored.

If you did not back up your iPad previously (either to iCloud or to your computer), you won't be able to restore your old data. Also, be careful not to backup your new iPad until you have restored the old backup (in the Backups section of the Summary of your iPad in iTunes, it notes when your last backup occurred).

If you need further help, reach me via phone at https://www.6ya.com/expert/john_77bb351c0c06b354

You are not the first one with a crash. You can report level crashes here.
Bugs known issues Candy Crush Saga Forum King
and hope they come with a solution.

That's because it's simply not powerful enough to handle ios8. I know apple gave the update but unless they give a new bug fixing update to fix the crashing, your stuck with ios8 and a crashing iPad.
I have my iPad 2 with ios7 and I'm not planning to update it.

Safari is junkola, get Chrome or another browser. Safari always has issues with mine.

Try to update it (if possible)

Close unused tabs

Tap Settings in your Home screen then tap Safari / Clear History, Cookies, and Cache.

Then restart your iPad. Press and hold the Sleep/Wake button until the red slider appears. Slide your finger across the slider to turn off iPad. To turn iPad back on, press and hold the Sleep/Wake until the Apple logo appears.