公式识别后解析错误

[lygiants]

0704.1445.pdf

[lygiants]

$$

            x\begin{array}{l}{{V_{\alpha_{i}\alpha_{j},\alpha_{k}\alpha_{l}}=\hfill}}\\ {{\displaystyle\int\phi_{\alpha_{i}\alpha_{j}}^{*}(x_{1},x_{2})V(x_{1}-x_{2})\phi_{\alpha_{k}\alpha_{l}}(x_{1},x_{2})d x_{1}d x_{2},}}\end{array}
            $$

                Error: Unsupported use of \hfill

[wangbinDL]

可以提供下具体公式的截图

[lygiants]

可以提供下具体公式的截图 图片不知道为啥上传不了, 这个文件您看下 0704.1445.md