Writing panel error

Every time I click on the “write” function to get to a blank writing panel, I get an “error on page” and it does not let me put my cursor in the white space to write. I have been using WordPress for two months and have had this problem since the beginning, but usually after refreshing a few times or navigating around and navigating back to “write” I can usually get into the panel. However, I’ve tried MANY times since yesterday and cannot get into the panel to write. Anyone have an idea as to why this is happening and how I can fix it?

Be forewarned – I’m very un-technical so please speak in non-programming language. 🙂 Thanks!