Did you commit your upgrade branch after you upgraded it to 8.18.15? If so, ok, now first make another branch in Mx8.18.15, and make that of your upgrade-branch of the commit you did after upgrading to 8.18.15. Then merge that branch to your upgrade branch.
If you have not commited after upgrading to 8.18.15, you will need to create that first. So create another upgrade-branch, commit it after upgrading to 8.18.15. Now try to import this branch into 9.12.4.
NB 9.12.5 is out since a couple of days and the list of bugfixes it pretty long, so probably useful to go to 9.12.5 while you are at it.
Hi Gunalan ,
The error says like the particular modular version is not installed, so check the version that you have installed.
First upgrade the main line as 9.12.4 and cut the branch line.
Hi Gunalan,
Please check your current branch line and previous as well as version
Thanks
-Hari