Unable to sign the package id (6IplFyll_4FoEedgSHG5hVCcvkY=)

I have done following steps for the mentioned package, please let me know if there is issue with the steps, Step 1: package had created and sent with due date ‘2019-12-31T18:30:00Z’ Step 2 : I am Listening ‘PACKAGE_EXPIRE’ event and on package Expiry event I had update the package expiry date to 2020-01-30T18:30:00Z Steps performed for updating new expiry date is myPackage.setExpiryDate(newExpiryDate); myPackage.setStatus(PackageStatus.DRAFT); eslClient.changePackageStatusToDraft(myPackage.getId()); eslClient.updatePackage(myPackage.getId(),myPackage); eslClient.sendPackage(myPackage.getId()); after that, I have checked both status(‘SENT’) and due date (‘2020-01-30T18:30:00Z’), both are correct. And also I can see package information, everything seems to be right . but I am unable to sign. Please have look on the above steps and code snippet to update the new expiry date, please let me know if there is any mistakes,