I have this error: java.lang.InternalError: Contact developers @ jforex.EAPAT.RSI_DATA(RSI_DATA.java:533) Error in indicator: java.lang.InternalError: Contact developers @ com.dukascopy.api.a.C.setOptInputParameter(Unknown Source)
"Contact developers" error comes from ta-lib library and usually means that there is an error in parameters. In your case timePeriod parameter should be >= 2. Change it to