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Let $X$ be a compact connected strongly pseudoconvex $CR$ manifold of realdimension 2n-1 in $\mathbb{C}^{N}$. It has been an interesting question to findan intrinsic smoothness criteria for the complex Plateau problem. For $n\ge 3$and $N=n+1$, Yau found a necessary and sufficient condition for the interiorregularity of the Harvey-Lawson solution to the complex Plateau problem bymeans of Kohn-Rossi cohomology groups on $X$ in 1981. For n=2 and $N\ge n+1$,the problem has been open for over 30 years. In this paper we introduce a newCR invariant $g^{(1,1)}(X)$ of $X$. The vanishing of this invariant will givethe interior regularity of the Harvey-Lawson solution up to normalization. Incase $n=2$ and N=3, the vanishing of this invariant is enough to give theinterior regularity.

Kohn-Rossi Cohomology and its application to the Complex Plateau Problem III