Skeleton SK_Mannequin needs to be saved problem

Hello. When transferring the MetaHumen character to my third person character, the error occurs when assigning the mannequin that the skeleton SK_mannequin must be saved. However, this error also appears on save, reboot, and redeployment.

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I am also having the same problem. I’m using Gorka’s video on how to change the mannequin into a Metahuman. I used Rolf, my own, as a tall one. The current version I’m using is 5.5.4 and I have plenty of memory to run the Metahuman in the game.

Has anyone else ever solved this problem yet?