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I cannot open a returned essay from smarthinking due to errors

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I sent an essay in to smarthinking for checking. The essay has been returned but I cannot view it due to the following code

undeclared prefix is the error code. what does this mean and can I fix it immediately? My essay is due in 2 days

I sent an essay in to smarthinking for checking. The essay has been returned but I cannot view it due to the following code undeclared prefix is the error code. what does this mean and can I fix it immediately? My essay is due in 2 days

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Reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.

  • Press and hold Shift and left-click the Reload button.
  • Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
  • Press "Cmd + Shift + R" (MAC)

Clear the cache and the cookies from sites that cause problems.

"Clear the Cache":

  • Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"

"Remove Cookies" from sites causing problems:

  • Tools > Options > Privacy > Cookies: "Show Cookies"