Failed to sign apk with CI

I run this

jarsigner -verbose -sigalg SHA1withRSA -dig
g SHA1 -keystore myname.keystore android-release-unsigned.apk myname

but I got an error of unable to open jar file: android-release-unsigned.apk

I also tried the full path it still show the same error. Have been stuck here for 1 hour, what should I do? sigh…