When acessing:
http://localhost/moodle/course/category.php?id=1&categoryedit=on&sesskey=R2EDPrmYaQ (Admin -> Courses -> Add/Change Course)

The following error happens:
Default exception handler:
Erro de codifica\xc3\xa7\xc3\xa3o detectado e deve ser corrigido por um programador:
paging_bar requires a perpage value. Debug: \n* line 2027 of /lib/outputcomponents.php: coding_exception thrown\n* line 2153 of /lib/outputrenderers.php: call to pagin
g_bar->prepare()\n* line 70 of /lib/outputrenderers.php: call to core_renderer->render_paging_bar()\n* line 2142 of /lib/outputrenderers.php: call to renderer_base->ren
der()\n* line 300 of /course/category.php: call to core_renderer->paging_bar()\n, referer: http://localhost/moodle/course/index.php?categoryedit=on