I can't instantiate a private class in Java

I am following a code from github . My problem now is that there is a line of code that tells me that it is private and that is why it gives me an error. I think I'm instantiating it right, but the error is still there.

import org.openapitools.client.ApiClient;
import org.openapitools.client.ApiException;
import org.openapitools.client.Configuration;
import org.openapitools.client.api.CustomizationApi;
import org.openapitools.client.model.TaxCalculationSettingTypes;
import org.openapitools.client.model.TaxCalculationSettingsResponse;

class Example {...

        TaxCalculationSettingTypes itemType = new TaxCalculationSettingTypes("Configuration"); 
        try {
            ...
}

And in this line: TaxCalculationSettingTypes itemType = new TaxCalculationSettingTypes("Configuration");it says error because TaxCalculationSettingTypes is private.

The TaxCalculationSettingTypes code is as follows:

@JsonAdapter(TaxCalculationSettingTypes.Adapter.class)
public enum TaxCalculationSettingTypes {
    ALL("All"),
    CONFIGURATION("Configuration"),
    BUNDLE("Bundle"),
    EXCLUSION("Exclusion"),
    OVERRIDE("Override"),
    NEXUS("Nexus"),
    EXEMPTION("Exemption");

    private String value;

    private TaxCalculationSettingTypes(String value) {
        this.value = value;
    }

    public String getValue() {
        return this.value;
    }

    public String toString() {
        return String.valueOf(this.value);
    }

    public static TaxCalculationSettingTypes fromValue(String value) {
        TaxCalculationSettingTypes[] var1 = values();
        int var2 = var1.length;

        for(int var3 = 0; var3 < var2; ++var3) {
            TaxCalculationSettingTypes b = var1[var3];
            if (b.value.equals(value)) {
                return b;
            }
        }

        throw new IllegalArgumentException("Unexpected value '" + value + "'");
    }

    public static class Adapter extends TypeAdapter<TaxCalculationSettingTypes> {
        public Adapter() {
        }

        public void write(JsonWriter jsonWriter, TaxCalculationSettingTypes enumeration) throws IOException {
            jsonWriter.value(enumeration.getValue());
        }

        public TaxCalculationSettingTypes read(JsonReader jsonReader) throws IOException {
            String value = jsonReader.nextString();
            return TaxCalculationSettingTypes.fromValue(value);
        }
    }
}

If I leave it without parameters (like this one on github) it also throws an error, and if I put any of the enum options in String it also throws an error.

The error it returns is the following:

error: enum types may not be instantiated