The following shows the numerical value of an error, its symbolic name, and a brief description of the error.

300 ERROR_ALREADY_RESET

Event semaphore is already reset.
301 ERROR_SEM_BUSY
Semaphore is busy.
302 Reserved
303 ERROR_INVALID_PROCID
Process identity is not valid.
304 ERROR_INVALID_PDELTA
Priority delta is not valid.
305 ERROR_NOT_DESCENDANT
Not descendant.
306 ERROR_NOT_SESSION_MANAGER
Requestor not session manager.
307 ERROR_INVALID_PCLASS
P class is not valid.
308 ERROR_INVALID_SCOPE
Scope is not valid.
309 ERROR_INVALID_THREADID
Thread identity is not valid.
310 ERROR_DOSSUB_SHRINK
Cannot shrink segment - DosSubSetMem.
311 ERROR_DOSSUB_NOMEM
No memory to satisfy request - DosSubAllocMem.
312 ERROR_DOSSUB_OVERLAP
Overlap of the specified block with a block of allocated memory - DosSubFreeMem.
313 ERROR_DOSSUB_BADSIZE
Size parameter is not valid - DosSubAllocMem or DosSubFreeMem.
314 ERROR_DOSSUB_BADFLAG
Flag parameter is not valid - DosSubSetMem.
315 ERROR_DOSSUB_BADSELECTOR
Segment selector is not valid.
316 ERROR_MR_MSG_TOO_LONG
Message too long for buffer.
317 ERROR_MR_MID_NOT_FOUND
Message identity number not found.
318 ERROR_MR_UN_ACC_MSGF
Unable to access message file.
319 ERROR_MR_INV_MSGF_FORMAT
Message file format is not valid.
320 ERROR_MR_INV_IVCOUNT
Insertion variable count is not valid.
321 ERROR_MR_UN_PERFORM
Unable to perform function.
322 ERROR_TS_WAKEUP
Unable to wake up.
323 ERROR_TS_SEMHANDLE
System semaphore is not valid.
324 ERROR_TS_NOTIMER
No timers available.
326 ERROR_TS_HANDLE
Timer handle is not valid.
327 ERROR_TS_DATETIME
Date or time is not valid.
328 ERROR_SYS_INTERNAL
Internal system error.
329 ERROR_QUE_CURRENT_NAME
Current queue name does not exist.
330 ERROR_QUE_PROC_NOT_OWNED
Current process does not own queue.
331 ERROR_QUE_PROC_OWNED
Current process owns queue.
332 ERROR_QUE_DUPLICATE
Duplicate queue name.
333 ERROR_QUE_ELEMENT_NOT_EXIST
Queue element does not exist.
334 ERROR_QUE_NO_MEMORY
Inadequate queue memory.

For DosOpenQueue, DosCreateQueue, and DosWriteQueue, the following applies: These calls use a system-wide pool of memory. Every DosOpenQueue and DosCreateQueue uses up 34 bytes of memory, which is freed on close. Every DosWriteQueue uses 24 bytes of memory, which is freed on read. If too many elements are written to queues, further opens, creates, reads, or writes fail with this error code.

335 ERROR_QUE_INVALID_NAME
Queue name is not valid.
336 ERROR_QUE_INVALID_PRIORITY
Queue priority parameter is not valid.
337 ERROR_QUE_INVALID_HANDLE
Queue handle is not valid.
338 ERROR_QUE_LINK_NOT_FOUND
Queue link not found.
339 ERROR_QUE_MEMORY_ERROR
Queue memory error.
340 ERROR_QUE_PREV_AT_END
Previous queue element was at end of queue.
341 ERROR_QUE_PROC_NO_ACCESS
Processdoesnothaveaccesstoqueues .
342 ERROR _ QUE _ EMPTY
Queueisempty .
343 ERROR _ QUE _ NAME _ NOT _ EXIST
Queuenamedoesnotexist .
344 ERROR _ QUE _ NOT _ INITIALIZED
Queuesnotinitialized .
345 ERROR _ QUE _ UNABLE _ TO _ ACCESS
Unabletoaccessqueues .
346 ERROR _ QUE _ UNABLE _ TO _ ADD
Unabletoaddnewqueue .
347 ERROR _ QUE _ UNABLE _ TO _ INIT
Unabletoinitializequeues .
349 ERROR _ VIO _ INVALID _ MASK
Functionreplacedisnotvalid .
350 ERROR _ VIO _ PTR
Pointertoparameterisnotvalid .
351 ERROR _ VIO _ APTR
Pointertoattributeisnotvalid .
352 ERROR _ VIO _ RPTR
Pointertorowisnotvalid .
353 ERROR _ VIO _ CPTR
Pointertocolumnisnotvalid .
354 ERROR _ VIO _ LPTR
Pointertolengthisnotvalid .
355 ERROR _ VIO _ MODE
Unsupportedscreenmode .
356 ERROR _ VIO _ WIDTH
Cursorwidthvalueisnotvalid .
357 ERROR _ VIO _ ATTR
Cursorattributevalueisnotvalid .
358 ERROR _ VIO _ ROW
Rowvalueisnotvalid .
359 ERROR _ VIO _ COL
Columnvalueisnotvalid .
360 ERROR _ VIO _ TOPROW
TopRowvalueisnotvalid .
361 ERROR _ VIO _ BOTROW
BotRowvalueisnotvalid .
362 ERROR _ VIO _ RIGHTCOL
Rightcolumnvalueisnotvalid .
363 ERROR _ VIO _ LEFTCOL
Leftcolumnvalueisnotvalid .
364 ERROR _ SCS _ CALL
Callissuedbyotherthansessionmanager .
365 ERROR _ SCS _ VALUE
Valueisnotforsaveorrestore .
366 ERROR _ VIO _ WAIT _ FLAG
Waitflagsettingisnotvalid .
367 ERROR _ VIO _ UNLOCK
Screennotpreviouslylocked .
368 ERROR _ SGS _ NOT _ SESSION _ MGR
Callernotsessionmanager .
369 ERROR _ SMG _ INVALID _ SGID
Sessionidentityisnotvalid .
369 ERROR _ SMG _ INVALID _ SESSION _ ID
SessionIDisnotvalid .
370 ERROR _ SMG _ NOSG
Nosessionsavailable .
370 ERROR _ SMG _ NO _ SESSIONS
Nosessionsavailable .
371 ERROR _ SMG _ GRP _ NOT _ FOUND
Sessionnotfound .
371 ERROR _ SMG _ SESSION _ NOT _ FOUND
Sessionnotfound .
372 ERROR _ SMG _ SET _ TITLE
Titlesentbyshellorparentcannotbechanged .
373 ERROR _ KBD _ PARAMETER
Parametertokeyboardisnotvalid .
374 ERROR _ KBD _ NO _ DEVICE
Nodevice .
375 ERROR _ KBD _ INVALID _ IOWAIT
I / Owaitspecifiedisnotvalid .
376 ERROR _ KBD _ INVALID _ LENGTH
Lengthforkeyboardisnotvalid .
377 ERROR _ KBD _ INVALID _ ECHO _ MASK
Echomodemaskisnotvalid .
378 ERROR _ KBD _ INVALID _ INPUT _ MASK
Inputmodemaskisnotvalid .
379 ERROR _ MON _ INVALID _ PARMS
OneormoreparameterstoDosMonisnotvalid .
380 ERROR _ MON _ INVALID _ DEVNAME
Devicenamestringisnotvalid .
381 ERROR _ MON _ INVALID _ HANDLE
Devicehandleisnotvalid .
382 ERROR _ MON _ BUFFER _ TOO _ SMALL
Buffertoosmall .
383 ERROR _ MON _ BUFFER _ EMPTY
Bufferisempty .
384 ERROR _ MON _ DATA _ TOO _ LARGE
Datarecordistoolarge .
385 ERROR _ MOUSE _ NO _ DEVICE
Mousedeviceclosed ;thedevicehandleisnotvalid .
386 ERROR _ MOUSE _ INV _ HANDLE
Mousedeviceclosed ;thedevicehandleisnotvalid .
387 ERROR _ MOUSE _ INV _ PARMS
Parametersfordisplaymodearenotvalid .
388 ERROR _ MOUSE _ CANT _ RESET
Functionassignedandcannotbereset .
389 ERROR _ MOUSE _ DISPLAY _ PARMS
Parametersfordisplaymodearenotvalid .
390 ERROR _ MOUSE _ INV _ MODULE
Modulenotvalid .
391 ERROR _ MOUSE _ INV _ ENTRY _ PT
Entrypointnotvalid .
392 ERROR _ MOUSE _ INV _ MASK
Functionmaskisnotvalid .
393 NO _ ERROR _ MOUSE _ NO _ DATA
Novaliddata .
394 NO _ ERROR _ MOUSE _ PTR _ DRAWN
Pointerdrawn .
395 ERROR _ INVALID _ FREQUENCY
Frequencyforbeepisnotvalid .
396 ERROR _ NLS _ NO _ COUNTRY_FILE
Cannot find COUNTRY.SYS file.
397 ERROR_NLS_OPEN_FAILED
Cannot open COUNTRY.SYS file.
398 ERROR_NLS_NO_CTRY_CODE
Country code not found.
398 ERROR_NO_COUNTRY_OR_CODEPAGE
Country code not found.
399 ERROR_NLS_TABLE_TRUNCATED
Table returned information truncated, buffer is too small.

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