| Error | Description |
| abort | The maximum memory that kdb was allowed, was exceeded. |
| adict | Dictionary assignment error. |
| access | Permissions error from bad login or attempting to run system command that isn't permitted |
| assign | You cannot assign a new value to kdb built-in functions |
| badtail | Badtail error is caused by a corrupt TP log |
| branch | A branch (if;do;while;$[.;.;.]) more than 255 byte codes away |
| cast | Error casting symbols to an invalid domain. |
| conn | Error opening handle. |
| constants | Too many constants (max 96) |
| domain | Argument to function is of the wrong type. |
| glim | `g# limit, kdb is currently limited to 99 concurrent `g#'s |
| globals | Too many global variables (32 max) |
| limit | Attempt to create list longer than allowable maximum |
| locals | Too many local variables (24 max) |
| mlim | More than 999 nested columns in splayed table |
| params | Too many parameters (8 max) |
| rank | Invalid number of arguments |
| stack | Function calls too many levels deep. Possibly recursive. |
| stop | A client query took longer than the time allowed. |