Unable to read the value of s_file_edition_type from the context file

If you are planning to upgrade R12.1.X to R12.2.X. After run checkMTpatch.sh on appsTier getting below error. 

 $ sh checkMTpatch.sh

 +===============================================================+

 |    Copyright (c) 2005, 2020 Oracle and/or its affiliates.     |

 |                     All rights reserved.                      |

 |             Oracle E-Business Suite Release 12.2              |

 |        Application Tier Technology Codelevel Checker         |

 +===============================================================+

Using context file from currently set applications environment:

/data02/EBS_r12.1/apps/inst/apps/UAT_test/appl/admin/UAT_test.xml

Unable to read the value of s_file_edition_type from the context file

Verify location and rerun this script.

Solution:- 

If you are running the utility to determine  which patches are missing on R12.1.X before the upgrade. So at this point it doesn't exist in the context_file. Because the script is used to check the 12.2 tech stacks for missing patches. 

So, the checkMTpatch.sh should only be run once you have run rapidwiz to create the upgrade file system (upgrade scenario).

The script checkDBpatch.sh can be run prior to rapidwiz as well.

But, checkMTpatch.sh should be run only after rapidwiz.