Farm Hereos: I can't buy boosters

Jenoohmy

I have never been able to buy boosters, such as, the hammer.  The only thing the app lets me purchase is more moves.  Where the symbols for the boosters are I have little lock pads instead.  I've tried deleting the game and downloading it again and that didn't work. Anyone know how I can fix this? Thanks in advance. 

Digger1

What exactly happens when you try to buy a Booster? Do you get any kind of error message? Please could you take a screenshot and upload it here so that we can have a look? 

Jenoohmy-2

What exactly happens when you try to buy a Booster? Do you get any kind of error message? Please could you take a screenshot and upload it here so that we can have a look? 

There are lock pads where the booster icons are supposed to be