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A resource error occurs when some resource runs out. For example, you can run out of virtual memory, or you can exceed the operating system limit on the number of simultaneously open files.
Often a resource error arises because of a programming mistake: for example, you may exceed the maximum number of open files because your program does not close files when it has finished with them. Or, you may run out of virtual memory because you have a non-terminating recursion in your program.
The SICStus_Error term for a resource error is
resource_error(Goal, Resource)
A copy of the goal, or 0 if no goal was responsible; for example
there is no particular goal to blame if you run out of virtual memory.
identifies the resource that was exhausted.
The values for Resource that are
currently in use are memory when attempting to use too much
memory and, since release 4.8, file_handle when attempting to
open too many files.