audioRecorder.startRecording is not a function

This error message suggests that the method "startRecording" is not defined or available for the object "audioRecorder".

There could be several reasons for this error:

1. The object "audioRecorder" might not be properly initialized or instantiated before calling the method "startRecording". Ensure that the object is created and initialized before calling any of its methods.

2. The method "startRecording" might be misspelled or incorrectly capitalized. Check the spelling and syntax of the method name.

3. The method "startRecording" might not be supported by the version or type of the audio recording library being used. Ensure that the library is up-to-date and compatible with the desired functionality.

4. There might be a problem with the environment or dependencies of the code. Check for any missing or conflicting dependencies and resolve them before running the code.

To resolve this error, try debugging the code and identifying the root cause of the issue. Consult the documentation or community forums for the library being used to ensure proper usage of its methods and functionality.