These codebase errors are normally caused by corrupted database index files. Please do the following: • Edit the CONFIG.SYS (CONFIG.NT for Windows NT and above) file on each computer with ScheduALL and change the FILES= line from 40 to 150. • Delete all the database index (.cdx) files in your shared \schedwin\data folder. • On 1 computer with ScheduALL, edit the ScheduALL icon properties and add the word `verify` to the end of the Target. It should look similar to (c:\schedwin\schedwin.exe verify). • Launch ScheduALL and login with Supervisor or equivalent. The database index files will be recreated. • Remove `verify` from the ScheduALL icon Target and launch ScheduALL as normal.