Final answer:
A Parse error occurs when the code does not follow the correct syntax or structure, possibly due to an unrecognized pattern. Double-check the code's syntax and pattern validity.
Step-by-step explanation:
A Parse error occurs when the code being executed does not follow the correct syntax or structure. In this case, the 'chocolate' pattern might not be recognized by the programming language being used, resulting in the error. Double-check the syntax and make sure the pattern is valid in the context of the code you are trying to run.