Blend Surface Problem

I tried to blend the two surfaces together. I successfully blended one side, however i can’t do the other side even if the surfaces were the same.
The surface has a open edge, even if i joined them.

The successful one looks like this below.

Please help! Thank you.

Please post your file

I redid the surface by mirroring the other half and it worked.
Sorry I didn’t save the original file.

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