Multiple signers and Multiple documents - com.silanis.esl.sdk.internal.EslServerException: Could not create a new package

Exception in thread "main" com.silanis.esl.sdk.internal.EslServerException: Could not create a new package in one-step Exception: HTTP POST on URI https://sandbox.esignlive.com/api/packages resulted in response with status code: [400, Bad Request]. Optional details: {"messageKey":"error.validation.sendPackage.noApprovals","message":"Cannot send package without approvals.","code":400,"name":"Validation Error"}
    at com.silanis.esl.sdk.service.PackageService.createPackageOneStep(PackageService.java:117)
    at com.silanis.esl.sdk.EslClient.createPackageOneStep(EslClient.java:333)
    at esign.DynamicTextTagExtractionTwoSigners.main(DynamicTextTagExtractionTwoSigners.java:56)
Caused by: com.silanis.esl.sdk.internal.RequestException: HTTP POST on URI https://sandbox.esignlive.com/api/packages resulted in response with status code: [400, Bad Request]. Optional details: {"messageKey":"error.validation.sendPackage.noApprovals","message":"Cannot send package without approvals.","code":400,"name":"Validation Error"}
    at com.silanis.esl.sdk.internal.RestClient.execute(RestClient.java:214)
    at com.silanis.esl.sdk.internal.RestClient.postMultipartPackage(RestClient.java:163)
    at com.silanis.esl.sdk.service.PackageService.createPackageOneStep(PackageService.java:113)
    ... 2 more
 

        EslClient eslClient = new EslClient(API_KEY, API_URL); 
        Calendar calendar = Calendar.getInstance(); 
        calendar.add(Calendar.DATE, 30); 
        List<Signer> signerList = new ArrayList<>(); 
        Signer signer1 = SignerBuilder.newSignerWithEmail("[email protected]") 
                .withFirstName("xx") 
                .withLastName("xx") 
                .withCustomId("Signer1")
                .build(); 
        
        Signer signer2 = SignerBuilder.newSignerWithEmail("[email protected]") 
                .withFirstName("xx") 
                .withLastName("xx") 
                .withCustomId("Signer2")
                .build(); 
        
        signerList.add(signer1); 
        signerList.add(signer2); 
        PackageBuilder packageToBuild = PackageBuilder.newPackageNamed("Multiple Documents Example") 
                .withStatus(PackageStatus.SENT); 
        
        for(Signer signer : signerList){ 
            packageToBuild.withSigner(signer); 
        } 
        
        List<Document> documentList = new ArrayList<>(); 
        Document document1 = DocumentBuilder.newDocumentWithName("Disclaimers") 
                .withId("document2") 
                .fromFile("C:/xxx/Disclaimers.pdf") 
                .withExtractionType(ExtractionType.TEXT_TAGS) 
                .enableExtraction()
                .build(); 
        
        Document document2 = DocumentBuilder.newDocumentWithName("Agreement") 
                .withId("document1") 
                .fromFile("C:/xxx/sdl-agreement_two_signers.pdf") 
                .withExtractionType(ExtractionType.TEXT_TAGS) 
                .enableExtraction()
                .build(); 
        
        for(Document document : documentList){ 
            packageToBuild.withDocument(document); 
        } 
        
        DocumentPackage pkg = packageToBuild.expiresAt(calendar.getTime()) 
                .build(); 
        
        PackageId packageId = eslClient.createPackageOneStep(pkg); 
        System.out.println(packageId); 
        System.out.println(eslClient.getPackageService().getSigningUrl(packageId, "Signer1")); 
        System.out.println(eslClient.getPackageService().getSigningUrl(packageId, "Signer2"));