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https://netbeans.org/kb/docs/cnd/toolchain.html Chapter "Creating a Custom Compiler Error Handler" Existing: @org.openide.util.lookup.ServiceProvider(service = org.netbeans.modules.cnd.spi.toolchain.CompilerProvider.class) public class CustomCompilerProvider extends ErrorParserProvider { Should be: @org.openide.util.lookup.ServiceProvider(service = org.netbeans.modules.cnd.spi.toolchain.ErrorParserProvider.class) public class CustomCompilerProvider extends ErrorParserProvider { Replace CompilerProvider to ErrorParserProvider.