When i am trying to use "ecgpuwave" class of "WFDB" to detect p-waves and got following error. How to solve this issue?

%Code
ecgpuwave('A00001','test');
[tm,signal]=rdsamp('A00001');
pwaves=rdann('A00001','test',[],[],[],'p');
plot(tm,signal(:,1));hold on;grid on
plot(tm(pwaves),signal(pwaves),'or'

%Error massage (in popup window)
WFDB Library Error:
 "getann: unexpected EOF in annotator test"

%Error massage (in command window)
Error using rdann (line 172)
Java exception occurred:
java.lang.NullPointerException