whatever simple code , I am running in Xsb prolog using Eclipse IDE , It is showing me error like this:
++Error[XSB/Runtime/P]: [Existence (No procedure usermod : demo / 1 exists)] []
Forward Continuation...
... machine:xsb_backtrace/1
... loader:load_pred1/1
... loader:load_pred0/1
... loader:load_pred/1
... x_interp:_$call/1
... x_interp:call_query/1
... standard:call_expose/1
... standard:catch/3
... x_interp:interpreter/0
... loader:ll_code_call/3
... standard:call_expose/1
... standard:catch/3
give me solution ,if any one is aware of this.
This error means that you are trying to call
demo/1predicate but it is not known to the system. So maybedemo/1is not defined, or you forgot to consult your source file after defining it.