额外的对齐标签已更改为 \cr。\end{split} 错误出现在下面的编码中

Question

\begin{equation*}
\begin{split}
c\sup_{L>0,L\in \mathbb{Z}}\Biggl[ 
\biggl\{ \smashoperator[r]{\sum_{k=-\infty}^{-1}}
& \biggl(\, \sum_{i=k-5}^{+\infty} \lambda_i 2^{(k-i)\alpha_1(0)-L\lambda} 
\!\biggr )^{\!q_1(0)} \biggr\}^{\!1/q_1(0)}\\
{}+\biggl\{ \sum_{k=-\infty}^{-1}
& \biggl(\, \sum_{i=0}^{+iggr\}^{\!1/q_1(0)}\,+\biggl\{ \sum_{k=0}^{L}
& \biggl(\, \sum_{i=k-5}\infty} \lambda_i 2^{(k-i)\alpha^-_1-L\lambda} 
\!\biggr )^{\!q_1(0)} \b^{+\infty} \lambda_i 2^{(k-i)(\alpha_1)_\infty-L\lambda} 
\!\biggr )^{\!q_1(\infty)} \biggr\}^{\!1/q_1(\infty)}\, \Biggr]
\end{split}
\end{equation*}