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To resolve this, go into the source code and replace the non-breaking space with a simple space (space bar). The easiest way to do this is to carry out a Ctrl F search for in the source code window. This will highlight every instance and you can go through manually and replace them. If there a lot of instances, copying from the source code into Notepad on a Windows machine will allow you to do a Ctrl H search and replace to replace the with a space. You can then copy the amended text from Notepad and put it back in the source code window.