Debugger entered--Lisp error: (wrong-type-argument number-or-marker-p nil)
  nnimap-request-group("\303\211tudes/Sup\303\251lec/Alumni" "Gmail" t ("\303\211tudes/Sup\303\251lec/Alumni" 3 ((1 . 434) (438 . 439) 441 (444 . 446) (448 . 450) (452 . 456) 458 460 462 466 (473 . 474) 484 (488 . 490) 492 (494 . 495) 498 501 504 515 524 529 (532 . 533) (537 . 538) 542 545 (548 . 549) 552 554 557 (560 . 562) 564 570 578 (584 . 585) 593 608 620 624 639 642 649 651 654 658 667 687 690 694 (698 . 699) 701 ...) ((unexist 1 90 99 101 105 107 109 113 115 320 323 330 (332 . 333) 335 344 (347 . 348) 352 (358 . 359) (361 . 362) 364 369 395 401 (403 . 405) (416 . 418) (421 . 427) (429 . 434) (438 . 439) 441 (444 . 446) (448 . 450) (452 . 456) 458 460 462 466 (473 . 474) 484 (488 . 490) 492 (494 . 495) 498 501 515 524 529 (532 . 533) (537 . 538) 542 ...)) nil ((modseq . "3895612") (uidvalidity . "102") (active 1 . 818) (permanent-flags %Answered %Flagged %Draft %Deleted %Seen $Phishing $Forwarded Redirected gnus-forward JunkRecorded $NotJunk NotJunk gnus-dormant $NotPhishing $Junk gnus-save %*))))
  gnus-request-group("\303\211tudes/Sup\303\251lec/Alumni" t nil ("\303\211tudes/Sup\303\251lec/Alumni" 3 ((1 . 434) (438 . 439) 441 (444 . 446) (448 . 450) (452 . 456) 458 460 462 466 (473 . 474) 484 (488 . 490) 492 (494 . 495) 498 501 504 515 524 529 (532 . 533) (537 . 538) 542 545 (548 . 549) 552 554 557 (560 . 562) 564 570 578 (584 . 585) 593 608 620 624 639 642 649 651 654 658 667 687 690 694 (698 . 699) 701 ...) ((unexist 1 90 99 101 105 107 109 113 115 320 323 330 (332 . 333) 335 344 (347 . 348) 352 (358 . 359) (361 . 362) 364 369 395 401 (403 . 405) (416 . 418) (421 . 427) (429 . 434) (438 . 439) 441 (444 . 446) (448 . 450) (452 . 456) 458 460 462 466 (473 . 474) 484 (488 . 490) 492 (494 . 495) 498 501 515 524 529 (532 . 533) (537 . 538) 542 ...)) nil ((modseq . "3895612") (uidvalidity . "102") (active 1 . 818) (permanent-flags %Answered %Flagged %Draft %Deleted %Seen $Phishing $Forwarded Redirected gnus-forward JunkRecorded $NotJunk NotJunk gnus-dormant $NotPhishing $Junk gnus-save %*))))
  gnus-select-newsgroup("\303\211tudes/Sup\303\251lec/Alumni" nil nil)
  gnus-summary-read-group-1("\303\211tudes/Sup\303\251lec/Alumni" nil t nil nil nil)
  gnus-summary-read-group("\303\211tudes/Sup\303\251lec/Alumni" nil t nil nil nil nil)
  gnus-group-read-group(nil t)
  gnus-group-select-group(nil)
  funcall-interactively(gnus-group-select-group nil)
  call-interactively(gnus-group-select-group nil nil)
  command-execute(gnus-group-select-group)