I'm sorry you're having trouble installing a new theme. Can you let us know what theme you were installing at the time. It looks like the theme you are using is throwing errors and we would like to be able to recreate that error here.
If you run into the issue of a blank screen again in WordPress, we have a guide for that here: Why is my website showing a blank page?. You can pass along the error messages to the theme developer so they can address any coding issues in the theme.
Hope this helps!
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