This error can be caused by 2 issues. Both are due to user error.
Introducing a php syntax error when editing php files. What this means is that you did not insert your modifications in the correct place or you accidentally added a character somewhere that it does not belong. Pay very close attention to details when editing php files. The most seemingly insignificant syntax errors will cause major display problems.
Using a text-editor that does not support php files. Many editors add formatting to the code that will cause php errors even though you cannot see this added fomatting with your eyes.
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