I get a ‘Too many grammars have been loaded’

The error message contains:

Too many grammars have been loaded. Number of grammars cannot exceed 1024

This is a limitation of Windows in terms of how many simultaneous voice grammars can exist. DRE spawns many grammars at load and even more as you join a session, and new drivers join.

This issue may be fixed down the line, as speech recognition partly moves towards cloud-based recognition


To fix this issue now, please do one of the following:

Method 1: Change to a single recognizer

  1. Locate the DRE Documents either by saying Open DRE Documents to DRE, or by finding it usually in C:\Documents\USER\DRE
  2. Exit DRE and make sure it is closed
  3. Open Config.json
  4. Edit the value of SpeechRecognizers (Ctrl+F to find it) from Multiple to Single
  5. Save the JSON file and re-open DRE


Method 2: Using Multiple Recognizers

  1. Open DRE
  2. Go to Sounds -> Recognition
  3. Disable one or more:
    1. Use Position Recognition
    2. Use Name Recognition
    3. Use Number Recognition

This will disable the grammar types like ‘Where’s Verstappen’, ‘Where’s car 33’, ‘Where is P2’, but reduces the number of voice grammars.

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