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diff --git a/source/troubleshooting.rst b/source/troubleshooting.rst
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--- a/source/troubleshooting.rst
+++ b/source/troubleshooting.rst
@@ -133,10 +133,10 @@ Common compiler problems
``undefined reference to setup()/loop()``
- Your sketch/program either does not include one of the :ref:`setup
- <setup()>` or :ref:`loop <loop()>` functions, or it was not found
- by the compiler. Your program must include both ``void setup()``
- and ``void loop()`` functions; they don't have to do anything, but
+ Your sketch/program either does not include one of the `setup
+ <setup()>`_ or `loop <loop()>`_ functions, or it was not found by
+ the compiler. Your program must include both ``void setup()`` and
+ ``void loop()`` functions; they don't have to do anything, but
they **must** be there.
You can start with an example program (to see one in the IDE,