Hyperledger Indy error: CommonInvalidStructure while using await sdk.proverCreateProof()

[dexterity2k16]

This is the proof_request json:

var proofReq = {
                'nonce': '123456789',
                'name': 'xyzabcd',
                'version': '1.0',
                'requested_attributes': {
                    'attr1_referent': {
                        'name': 'Firstname'
                    },
                    'attr2_referent': {
                        'name': 'Lastname'
                    },
                    'attr3_referent': {
                        'name': 'acl'
                    }
                },
                'requested_predicates': {
                    'predicate1_referent': {
                        'name': 'average',
                        'p_type': '>=',
                        'p_value': 4,
                        // 'restrictions': [{'cred_def_id': faberTranscriptCredDefId}]
                    }
                }
            }

this is the requested_credentials_json:

 let requested_credentials_json = {
                'self_attested_attributes': {
                    'attr1_referent':'shrinivas',
                    'attr2_referent':'deshmukh',
                    'attr3_referent':'Tnd8R2nbJBKW4rEL8ag88U'
                },
                'requested_attributes': {
                    'attr1_referent': { 'cred_id': referent, 'revealed': true },

                'attr2_referent': { 'cred_id': referent, 'revealed': true },

                'attr3_referent': { 'cred_id': referent, 'revealed': true }
                },

                'requested_predicates': {
                    'predicate1_referent': { 'cred_id': referent }
                }
            }

this is the schema_json:

{ 'Th7MpTaRZVRYnPiabds81Y:2:newSchema1212:2.0':
   { ver: '1.0',
     id: 'Th7MpTaRZVRYnPiabds81Y:2:newSchema1212:2.0',
     name: 'newSchema1212',
     version: '2.0',
     attrNames: [ 'Lastname', 'Firstname', 'acl' ],
     seqNo: 17 } }

This is the error:

"name": "IndyError",
"message": "CommonInvalidStructure",
"indyCode": 113,
"indyName": "CommonInvalidStructure",
"indyCurrentErrorJson": null

Any help is highly appreciated! Thank you in advance.