ERROR: missing or invalid vector defining dimer

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You are using IBRION=44 on something other than a transition state and/or you haven't defined the eigenvalues in the POSCAR (displacements of the imaginary frequency).

If you do want to use IBRION=44 and get this error you should ensure that you have pasted all eigenvalues in the POSCAR and that there is one white line seperating the block of coordinates and eigenvalues.