}
        return name;
    }

    private void executeCommand(final File inputFile, final File outputFile) {

        if (StringUtil.isBlank(command)) {
            throw new CrawlerSystemException("command is empty.");
        }

        final Map<String, String> params = new HashMap<>();
        params.put("$INPUT_FILE", inputFile.getAbsolutePath());
        params.put("$OUTPUT_FILE", outputFile.getAbsolutePath());

If you are using Groovy, it's likely that you unintentionally added the `private` modifier to a property declaration:

```groovy
@InputFile
RegularFileProperty inputFile // this is a public property

@InputFile
private RegularFileProperty inputFile // this is a field, remove the `private` modifier
```

[[ignored_annotations_on_method]]
== Invalid annotation on method

    @SuppressWarnings("GrDeprecatedAPIUsage")
    static class SimpleTask extends DefaultTask {
        @Input
        String inputString
        @InputFile
        File inputFile
        @InputDirectory
        File inputDirectory
        @InputFiles
        File inputFiles
        @OutputFile
        File outputFile
        @OutputFiles
        Set<File> outputFiles
        @OutputDirectory

@CacheableTask
abstract class AssembleDslDocTask extends DefaultTask {
    @PathSensitive(PathSensitivity.NONE)
    @InputFile
    abstract RegularFileProperty getSourceFile();

    @PathSensitive(PathSensitivity.NONE)
    @InputFile
    abstract RegularFileProperty getClassMetaDataFile();

    @PathSensitive(PathSensitivity.NONE)
    @InputFile
    abstract RegularFileProperty getPluginsMetaDataFile();

    @PathSensitive(PathSensitivity.RELATIVE)

                def outputFile = file('build/output.txt')
                def inputFile = file('input.txt')
                inputs.file inputFile
                inputs.file 'unrelated-input.txt'
                outputs.file outputFile
                outputs.cacheIf { true }
                doLast {
                    if (!outputFile.exists() || outputFile.text != inputFile.text) {
                        outputFile.parentFile.mkdirs()

        buildFile << """
            task myTask {
                def inputFile = file("input.txt")
                def outputFile = file("output.txt")
                inputs.file(inputFile)
                outputs.file(outputFile)
                doLast {
                    outputFile.text = inputFile.text
                }
            }
        """
        file("input.txt").text = "input"

            error(missingNormalizationStrategyConfig { type('MyTask').property('inputFile').annotatedWith('InputFile') }, 'validation_problems', 'missing_normalization_annotation'),
            error(missingNormalizationStrategyConfig { type('MyTask').property('inputFiles').annotatedWith('InputFiles') }, 'validation_problems', 'missing_normalization_annotation'),
        ])

        and:

                void execute() {
                    def buildDirectory = projectLayout.buildDirectory
                    inputFiles.files.each { File inputFile ->
                        def outputFile = buildDirectory.file(inputFile.name + ".out").get().asFile
                        GFileUtils.copyFile(inputFile, outputFile)
                    }
                }
            }
            allprojects {

                @InputFile inputFile
                @OutputFile outputFile

                @TaskAction copy() {
                    outputFile.parentFile.mkdirs()
                    outputFile.text = inputFile.text
                }
            }
            task customTask(type: NonCacheableTask) {
                inputFile = file("input.txt")

import org.gradle.api.tasks.Destroys;
import org.gradle.api.tasks.IgnoreEmptyDirectories;
import org.gradle.api.tasks.Input;
import org.gradle.api.tasks.InputDirectory;
import org.gradle.api.tasks.InputFile;
import org.gradle.api.tasks.InputFiles;
import org.gradle.api.tasks.Internal;
import org.gradle.api.tasks.LocalState;
import org.gradle.api.tasks.Nested;
import org.gradle.api.tasks.Optional;
import org.gradle.api.tasks.OutputDirectories;