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Coding error detected, it must be fixed by a programmer: Failed to unserialise data from file. Either failed to read, or failed to write.

Debug info:
Error code: codingerror

Stack trace:

line 469 of \cache\stores\file\lib.php: coding_exception thrown
line 372 of \cache\stores\file\lib.php: call to cachestore_file->prep_data_after_read()
line 299 of \cache\classes\loaders.php: call to cachestore_file->get()
line 1454 of \cache\classes\loaders.php: call to cache->get()
line 1230 of \cache\classes\loaders.php: call to cache_application->get()
line 261 of \cache\classes\factory.php: call to cache_application->__construct()
line 201 of \cache\classes\factory.php: call to cache_factory->create_cache()
line 174 of \cache\classes\loaders.php: call to cache_factory->create_cache_from_definition()
line 592 of \lib\coursecatlib.php: call to cache::make()
line 1019 of \lib\coursecatlib.php: call to coursecat::get_tree()
line 1430 of \course\renderer.php: call to coursecat->get_children()
line 1516 of \course\renderer.php: call to core_course_renderer->coursecat_subcategories()
line 1627 of \course\renderer.php: call to core_course_renderer->coursecat_category_content()
line 2141 of \course\renderer.php: call to core_course_renderer->coursecat_tree()
line 263 of \index.php: call to core_course_renderer->frontpage_categories_list()