| NAME | HEX | DEC | Description |
| ERROR_FIRST | 0x70000000 | 1879048192 | The error code offset. If any function returns a value greater than this constant, it means that the function failed with some error code. |
| ERROR_FILENOTFOUND | 0x70000001 | 1879048193 | The file was not found. |
| ERROR_LOADFILE | 0x70000002 | 1879048194 | Cannot load the file. |
| ERROR_SAVEFILE | 0x70000003 | 1879048195 | Cannot save the file. |
| ERROR_MISSEDIMGLOADER | 0x70000004 | 1879048196 | Cannot find or load the "NsImgLdr.dll" file in the "Bin" directory. |
| ERROR_OPTIONNOTFOUND | 0x70000005 | 1879048197 | There is no such option in the current configuration. |
| ERROR_NOBLOCKS | 0x70000006 | 1879048198 | The Image object must have at least one text block for this operation. |
| ERROR_BLOCKNOTFOUND | 0x70000007 | 1879048199 | Cannot find the specified Block object. |
| ERROR_INVALIDINDEX | 0x70000008 | 1879048200 | An invalid index was specified. |
| ERROR_INVALIDPARAMETER | 0x70000009 | 1879048201 | An invalid parameter was specified. |
| ERROR_FAILED | 0x7000000A | 1879048202 | A general error. |
| ERROR_INVALIDBLOCKTYPE | 0x7000000B | 1879048203 | An invalid block type was specified. |
| ERROR_EMPTYTEXT | 0x7000000D | 1879048205 | The text block, line, or character is empty. |
| ERROR_LOADINGDICTIONARY | 0x7000000E | 1879048206 | Cannot load the dictionary file (.lng file) or NsSpell.dll. |
| ERROR_LOADCHARBASE | 0x7000000F | 1879048207 | Cannot load the character templates file. |
| ERROR_NOMEMORY | 0x70000010 | 1879048208 | Not enough memory for the operation. |
| ERROR_CANNOTLOADGS | 0x70000011 | 1879048209 | GhostScript is required for PDF support, see the PDF Support section for details. |
| ERROR_CANNOTPROCESSPDF | 0x70000012 | 1879048210 | GhostScript was unable to start or process the PDF file. |
| ERROR_NOIMAGE | 0x70000013 | 1879048211 | No image was loaded for OCR. |
| ERROR_MISSEDSTEP | 0x70000014 | 1879048212 | Some OCR steps required for this operation were skipped. Call Img_OCR before this operation. |
| ERROR_OUTOFIMAGE | 0x70000015 | 1879048213 | The specified block position is out of the image. |
| ERROR_EXCEPTION | 0x70000016 | 1879048214 | An unexpected exception! Please contact us if you get this error. |
| ERROR_NOTALLOWED | 0x70000017 | 1879048215 | The operation is prohibited. Refer to the function documentation for details. |
| ERROR_NODEFAULTDEVICE | 0x70000018 | 1879048216 | There is no default scanning device. |
| ERROR_NOTAPPLICABLE | 0x70000019 | 1879048217 | The function is not applicable for this block type. |
| ERROR_MISSEDBARCODEDLL | 0x7000001A | 1879048218 | Cannot find or load the "NsBars.dll" file in the "Bin" directory. |
| ERROR_PENDING | 0x7000001B | 1879048219 | The operation has not been finished yet. |
| ERROR_OPERATIONCANCELLED | 0x7000001C | 1879048220 | The operation was cancelled. |
| ERROR_TOOMANYLANGUAGES | 0x7000001D | 1879048221 | Too many languages were selected for recognition (more than 8). |
| ERROR_OPERATIONTIMEOUT | 0x7000001E | 1879048222 | The operation takes too much time. See the "Main/Timeout" option. |
| ERROR_LOAD_ASIAN_MODULE | 0x7000001F | 1879048223 | Cannot load Asian module "asian.dll". |
| ERROR_LOAD_ASIAN_LANG | 0x70000020 | 1879048224 | Cannot load ".lng" file from "asian" folder. |
| ERROR_INVALIDOBJECT | 0x70010000 | 1879113728 | An invalid object was specified. |
| ERROR_TOOMANYOBJECTS | 0x70010001 | 1879113729 | Too many objects were created. Probably you create new objects with the XXX_Create function in a loop, but do not release them with the XXX_Destroy function. |
| ERROR_DLLNOTLOADED | 0x70010002 | 1879113730 | Cannot find or load the "NSOCR.dll" file. |
| ERROR_DEMO | 0x70000003 | 1879113731 | A limitation of the trial version. |