title: Not Able to add TextTab
body: <p>Hi I am able to send envelope by adding signhere tab but when i am trying to add TextTabs it is giving below error(I am using rest API's)</p>
  
  <blockquote>
    <p><strong>INVALID_REQUEST_BODY</strong> The request body is missing or improperly formatted. Null object cannot be converted to a value type.</p>
  </blockquote>
  
  <p>Below is my request JSON of envelope definition</p>
  
  <pre><code>{
  "documents": [{
          "documentId": "1136641236",
          "uri": null,
          "remoteUrl": null,
          "name": "ABC Merchant Agreement",
          "password": null,
          "transformPdfFields": null,
          "fileExtension": null,
          "matchBoxes": null,
          "order": null,
          "pages": null,
          "documentFields": null,
          "encryptedWithKeyManager": null,
          "documentBase64": "documentBase64",
          "applyAnchorTabs": null
      }
  ],
  "recipients": {
      "signers": [{
              "signatureInfo": null,
              "defaultRecipient": null,
              "tabs": {
                  "signHereTabs": [{
                          "name": null,
                          "tabLabel": null,
                          "scaleValue": null,
                          "optional": null,
                          "documentId": "1136641236",
                          "recipientId": "2044556663",
                          "pageNumber": "1",
                          "xPosition": null,
                          "yPosition": null,
                          "anchorString": "SIGNATUREOWNER1",
                          "anchorXOffset": null,
                          "anchorYOffset": null,
                          "anchorUnits": null,
                          "anchorIgnoreIfNotPresent": null,
                          "anchorCaseSensitive": "True",
                          "anchorMatchWholeWord": "True",
                          "anchorHorizontalAlignment": null,
                          "tabId": null,
                          "templateLocked": null,
                          "templateRequired": null,
                          "conditionalParentLabel": null,
                          "conditionalParentValue": null,
                          "customTabId": null,
                          "mergeField": null,
                          "status": null,
                          "errorDetails": null
                      }
                  ],
                  "initialHereTabs": null,
                  "signerAttachmentTabs": null,
                  "approveTabs": null,
                  "declineTabs": null,
                  "fullNameTabs": null,
                  "dateSignedTabs": null,
                  "envelopeIdTabs": null,
                  "companyTabs": null,
                  "titleTabs": null,
                  "textTabs": [{
                          "height": null,
                          "isPaymentAmount": null,
                          "formula": null,
                          "validationPattern": null,
                          "validationMessage": null,
                          "shared": null,
                          "requireInitialOnSharedChange": null,
                          "senderRequired": null,
                          "requireAll": null,
                          "name": "TextTab",
                          "value": null,
                          "originalValue": null,
                          "width": null,
                          "required": "true",
                          "locked": "false",
                          "concealValueOnDocument": null,
                          "disableAutoSize": null,
                          "maxLength": null,
                          "tabLabel": "gjk",
                          "font": null,
                          "bold": null,
                          "italic": null,
                          "underline": null,
                          "fontColor": null,
                          "fontSize": "Size12",
                          "documentId": "1136641236",
                          "recipientId": "2044556663",
                          "pageNumber": "1",
                          "xPosition": null,
                          "yPosition": null,
                          "anchorString": "TEXTTABPLACEHOLDER",
                          "anchorXOffset": null,
                          "anchorYOffset": null,
                          "anchorUnits": null,
                          "anchorIgnoreIfNotPresent": null,
                          "anchorCaseSensitive": "True",
                          "anchorMatchWholeWord": "True",
                          "anchorHorizontalAlignment": null,
                          "tabId": null,
                          "templateLocked": null,
                          "templateRequired": null,
                          "conditionalParentLabel": null,
                          "conditionalParentValue": null,
                          "customTabId": null,
                          "mergeField": null,
                          "status": null,
                          "errorDetails": null
                      }
                  ],
                  "numberTabs": null,
                  "ssnTabs": null,
                  "dateTabs": null,
                  "zipTabs": null,
                  "emailTabs": null,
                  "noteTabs": null,
                  "checkboxTabs": null,
                  "radioGroupTabs": null,
                  "listTabs": null,
                  "firstNameTabs": null,
                  "lastNameTabs": null,
                  "emailAddressTabs": null,
                  "formulaTabs": null
              },
              "signInEachLocation": null,
              "offlineAttributes": null,
              "requireSignerCertificate": null,
              "requireSignOnPaper": null,
              "canSignOffline": null,
              "isBulkRecipient": null,
              "bulkRecipientsUri": null,
              "recipientSuppliesTabs": null,
              "excludedDocuments": null,
              "name": "name",
              "email": "emailid",
              "emailRecipientPostSigningURL": null,
              "signingGroupId": null,
              "signingGroupName": null,
              "signingGroupUsers": null,
              "recipientId": "2044556663",
              "recipientIdGuid": null,
              "accessCode": null,
              "addAccessCodeToEmail": null,
              "requireIdLookup": null,
              "idCheckConfigurationName": null,
              "socialAuthentications": null,
              "phoneAuthentication": null,
              "samlAuthentication": null,
              "smsAuthentication": null,
              "userId": null,
              "clientUserId": null,
              "embeddedRecipientStartURL": null,
              "customFields": null,
              "routingOrder": "1",
              "idCheckInformationInput": null,
              "recipientAttachments": null,
              "note": null,
              "roleName": null,
              "status": null,
              "signedDateTime": null,
              "deliveredDateTime": null,
              "declinedDateTime": null,
              "sentDateTime": null,
              "declinedReason": null,
              "deliveryMethod": null,
              "faxNumber": null,
              "templateLocked": null,
              "templateRequired": null,
              "emailNotification": null,
              "inheritEmailNotificationConfiguration": null,
              "errorDetails": null,
              "recipientAuthenticationStatus": null,
              "totalTabCount": null
          }
      ],
      "agents": null,
      "editors": null,
      "intermediaries": null,
      "carbonCopies": null,
      "certifiedDeliveries": null,
      "inPersonSigners": null,
      "recipientCount": null,
      "currentRoutingOrder": null,
      "errorDetails": null
  },
  "customFields": {
      "textCustomFields": [{
              "fieldId": "788788",
              "name": "AppNumber",
              "show": "false",
              "required": "false",
              "value": "788788",
              "configurationType": null,
              "errorDetails": null
          }
      ],
      "listCustomFields": null
  },
  "eventNotification": null,
  "brandId": "BrandId",
  "allowRecipientRecursion": null,
  "templateId": null,
  "templateRoles": null,
  "compositeTemplates": null,
  "accessibility": null,
  "transactionId": null,
  "status": "sent",
  "documentsUri": null,
  "recipientsUri": null,
  "asynchronous": null,
  "envelopeUri": null,
  "emailSubject": "ABC Agreement",
  "emailBlurb": "Please Sign",
  "envelopeId": null,
  "signingLocation": null,
  "customFieldsUri": null,
  "envelopeIdStamping": null,
  "authoritativeCopy": null,
  "notification": {
      "useAccountDefaults": null,
      "reminders": {
          "reminderEnabled": "true",
          "reminderDelay": "1",
          "reminderFrequency": "2"
      },
      "expirations": {
          "expireEnabled": "true",
          "expireAfter": "2",
          "expireWarn": "1"
      }
  },
  "notificationUri": null,
  "enforceSignerVisibility": null,
  "enableWetSign": null,
  "allowMarkup": null,
  "allowReassign": null,
  "createdDateTime": null,
  "lastModifiedDateTime": null,
  "deliveredDateTime": null,
  "sentDateTime": null,
  "completedDateTime": null,
  "voidedDateTime": null,
  "voidedReason": null,
  "deletedDateTime": null,
  "declinedDateTime": null,
  "statusChangedDateTime": null,
  "documentsCombinedUri": null,
  "certificateUri": null,
  "templatesUri": null,
  "messageLock": null,
  "recipientsLock": null,
  "useDisclosure": null,
  "emailSettings": null,
  "purgeState": null,
  "lockInformation": null,
  "is21CFRPart11": null
  }
  </code></pre>