请教老师，这种是什么情况，应该怎么办？
help xtgranger发现已下载
package installation
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package name:  xtgrangert.pkg
        from:  http://fmwww.bc.edu/repec/bocode/x/

checking xtgrangert consistency and verifying not already installed...
all files already exist and are up to date.
但仍报错
. xtgranger ict IT,lag(2)
command xtgranger is unrecognized
r(199);
用ssc install也不行
. ssc install xtgranger
ssc install: "xtgranger" not found at SSC, type search xtgranger
(To find all packages at SSC that start with x, type ssc describe x)
r(601);