This error message suggests that the localhost connection between Maple and the kernel was properly established when Maple started, but then was broken. Likely, one the following is the culprit:
- Your worksheet is corrupted;
- Maple sensed that some loop will not terminate, some computation would be too demanding (for example 2^(2^32-1)), or Maple was consuming too much of the RAM or CPU during a calculation; or
- Your installation of Maple is corrupted.
If Maple is fully up-to-date, and if rebuilding your worksheet results in the same error, you likely need to reinstall Maple from a fresh download link. Please contact firstname.lastname@example.org for this link.