[Help] Client download ERROR: Signature verification failed---waiting online

I am new user , and i use the docker run my urbackup server yesterday.
I add the new client ,and then i run the command on the client like the below
.But i get an ERROR : Signature verification failed . So how can to fix it , help me ,pls.
(TF=mktemp && wget “” -O $TF && sh $TF && rm -f $TF && ( [ ! -e /etc/default/urbackupclient ] || sed -i ‘s/INTERNET_ONLY=false/INTERNET_ONLY=true/’ /etc/default/urbackupclient ) && ( [ ! -e /etc/sysconfig/urbackupclient ] || sed -i ‘s/INTERNET_ONLY=false/INTERNET_ONLY=true/’ /etc/sysconfig/urbackupclient )) i get a ERROR: Signature verification failed. So how can do to fix the problem?

Help!Help! Anyone known about this ,
I try use the command ‘curl’ on my localhost, i get the message “Sorry. File not found.” I need the help .