 uninstantiation_error(+Term)
uninstantiation_error(+Term)open(File, read, input) 
cannot succeed because the system will allocate a new unique stream 
handle that will never unify with input.
 uninstantiation_error(+Term)
uninstantiation_error(+Term)open(File, read, input) 
cannot succeed because the system will allocate a new unique stream 
handle that will never unify with input.