我正在尝试安装＆＃39; io＆＃39;我的Macbook Air上的Octave包，因为我想将.mat文件转换为.xls文件。但是，当我尝试安装软件包时，会出现以下错误：
octave:33> pkg install io-2.2.6.tar.gz
gzip: /Users/mlt660609/Downloads/io-2.2.6.tar.gz: not in gzip format
A(I): index out of bounds; value 3 out of bound 2
error: called from 'install' in file /usr/local/octave/3.8.0/share/octave/3.8.0/m/pkg/private/install.m near line 102, column 19
error: called from:
error: /usr/local/octave/3.8.0/share/octave/3.8.0/m/pkg/private/install.m at line 146, column 5
error: /usr/local/octave/3.8.0/share/octave/3.8.0/m/pkg/pkg.m at line 394, column 9
任何人都可以帮忙吗？感谢。