import of private key from ZilPay failed

[SvenMeyer]

I stored the private key of a test account I used with ZilPay , and wanted to import it with zil, but got the following error :

$ zli wallet from 447a392d410..............................ec759d07bce0a0c6e2dc41b5c
panic: invalid private key

goroutine 1 [running]:
zli/cmd/wallet.glob..func3(0xd75e80, 0xc000592980, 0x1, 0x1)
	/home/sum/DEV/ZIL/zli/cmd/wallet/from.go:49 +0x2b0
github.com/spf13/cobra.(*Command).execute(0xd75e80, 0xc000592940, 0x1, 0x1, 0xd75e80, 0xc000592940)
	/root/go/pkg/mod/github.com/spf13/cobra@v0.0.5/command.go:830 +0x29d
github.com/spf13/cobra.(*Command).ExecuteC(0xd72780, 0x4438fa, 0xd36a60, 0xc000000180)
	/root/go/pkg/mod/github.com/spf13/cobra@v0.0.5/command.go:914 +0x2fb
github.com/spf13/cobra.(*Command).Execute(...)
	/root/go/pkg/mod/github.com/spf13/cobra@v0.0.5/command.go:864
zli/cmd.Execute()
	/home/sum/DEV/ZIL/zli/cmd/root.go:55 +0x31
main.main()
	/home/sum/DEV/ZIL/zli/main/main.go:22 +0x20

Importing the private key into a (new) ZilPay wallet worked without a problem.