Upgrading Patch 10.2.600.29 Issue

Hi experts, Our current application version is 10.2.600.12. Application is installed as Single Sign-on. When we are trying to upgrade the patch 10.2.600.29 using Administration Console. System is throwing below mentioned error

Error

Could you please suggest how to resolve this issue?

Have you confirmed that Site Name is in fact not blank in the environment you are trying to upgrade?

@Hari_Dutt That looks like it is trying to deploy a new app server that has no information. Did the config get cleared out? Are you sure you followed all of the small details in the upgrade guide on opening and closing the EAC deleting and reinstalling task agents?

Those are the things I get tripped up on.