Class juce::AudioProcessor - external symbol unresolved reference

Hi, i’m new to juce and i want to create my first project. I am opening the project with visual studio 2019 and I get several warnings and an error. The error indicates that → the reference to the external symbol “class juce :: AudioProcessor” cannot be resolved. Thanks for helping, greetings

The error is telling you that you need a function with the following signature somewhere in your project (normally at the bottom of PluginProcessor.cpp):

juce::AudioProcessor* JUCE_CALLTYPE createPluginFilter();

This should just return new MyAudioProcessor();, where MyAudioProcessor is the name of your custom AudioProcessor implementation.