| Text | Length of data to be stacked is zero or negative. |
| Expl. | The length of data to be stacked must be specified as non-zero and positive. |
| Actn. | Check program and correct error. |
| Text | Stack destroyed, command was expected. |
| Expl. | Natural tried to read a command from the top of the stack, but none was found. |
| Actn. | Check program and correct error. |
| Text | Stack destroyed, data expected. |
| Expl. | Natural tried to read data from the top of the stack, but no information was available (can be produced by specifying: STACK=(EX pgm:)). Data must be specified for an INPUT statement. If default data are to be passed to INPUT fields, specify data for a non-existent INPUT field. The data will be ignored in delimiter mode. |
| Actn. | Check program and correct error. |
| Text | Stack empty. |
| Expl. | Natural tried to read data from the stack, but the stack was empty. Either an internal error has occurred, or the stack was destroyed. |
| Actn. | Check program and correct error. |
| Text | Stack data overflow. |
| Expl. | The amount of stack data does not fit into the stack area. You can stack a maximum of 999 elements. |
| Actn. | Check program and reduce the number or size of fields to be
stacked. |
| Text | Invalid UTF-16 data. |
| Expl. | The data to be stacked do not represent a valid UTF-16 encoding. |
| Actn. | Ensure that the length of the UTF-16 character string in bytes is
a multiple of 2. |
| Text | SET KEY error, function key bit not supplied. |
| Actn. | Check program and correct error. |
| Text | SET KEY error, function key not available. |
| Expl. | The selected function key in a SET KEY statement is not defined to Natural. |
| Actn. | Check program and correct error. |
| Text | Error in SET KEY statement. |
| Expl. | A variable has been specified after "SET KEY", and the variable contains an invalid value. Valid values are: "PA1" to "PA3", "PF1" to "PF24", "CLR", and "ENTR". This error may also occur if the variable contains "ENTR" but a SET KEY statement option other than the NAMED clause is applied to the key. |
| Actn. | Correct error in program. |
