Can't Write to cronjobs.php

The "coremio/configuration/cronjobs.php" file is a systemic file where scheduled tasks are run time. The time information when a task will run again is kept in this file.

In some cases, the system cannot write to this file and causes systemic problems. 

These cases are described below;

1. The file does not have permission to write.
2. The write operation was interrupted because the server resource limits were insufficient.
3. The file could not be written due to a lack of disk space.

For the solution;

• Make sure that the chmode setting of coremio/configuration/cronjobs.php is 0777
• Make sure php resource limits are high. (Example: memory_limit, max_execution_time etc.)
• Make sure your hosting disk space is high. (At least 200 MB)
• Make sure the following functions are not disable in your server.
  disk_free_space()
  disk_total_space()