TexParser.parse() fails

[CarlosGamezSynergy]

Bug description

When following the example in the documentation, the TexParser(value).parse() method throws a ParserException.

The following ParserException was thrown while dispatching notifications for
MathFieldEditingController:
Instance of 'ParserException': end of input expected (at 1:5)

To Reproduce

Steps to reproduce the behavior:

1. Setup an empty flutter project
2. Install math_keyboard
3. Create a MathField widget as per the math_keyboard documentation
4. Setup printing the parsed output on the onChanged method as follows:

onChanged: (String value) {
  Expression parsedExpression = TeXParser(value).parse();
  print(parsedExpression.simplify().toString());
},

7. Throws error described above

[github-actions]

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