Need help with nav mesh issue

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I hope someone can help me.I've looked extensively online for answers,watched and read tutorials,and I'm still stuck.I have plenty of mods I want to use in the game as merged files.I've installed the mods(Mod Organizer),put them in order(LOOT),repaired and cleaned them(TES5Edit),and merged them(Merge Plugins).I merged alike items together.After finishing each merge,I get the message that mesh NAVI:00012FB4 needs to be fixed in Creation Kit.CK won't load the merge,and as I understand it now,It can't load but 1 esp at a time or whatever.I've read info about using TES5Edit to delete the NAVI file in question and saving the merge in CK to let it rebuild it.I've also read about using Wrye Bash to ESMify the merge so that CK would open it.Is this what I need to do?If so,could someone please give me step by step directions on how to proceed with Wrye Bash,then CK?Sorry for this,I guess I'm just a little slow in understanding all this.I really want to use my merges in the game,and I can't until I figure this out.Thanks in advance for your help.