has no member named 'length'

When trying to compile an esp32 wroom with arduino uno with the library AsyncTCP I have this error:

Documents\Arduino\libraries\ESPAsyncWebServer-master\src/AsyncEventSource.h:89:59: error: 'const class LinkedList' has no member named 'length'
89 | size_t packetsWaiting() const { return _messageQueue.length(); }
| ^~~~~~

thanks for your help

Start with the reported call in ESPAsyncWebServer-master/src/AsyncEventSource.h at line 89, then inspect the LinkedList API used by _messageQueue. Reproduce the ESP32/Arduino Uno compilation error if the environment is available. Done means the compatibility problem is understood and the supported resolution is documented or verified.

Written by the indexing model from the issue text.