ERROR Codes

QB64 Compiler Errors: To troubleshoot compiler errors try this: recompile scripts Please report any Operating System or Compiler errors or failures you cannot fix here.

It's a good idea to exclude "QB64.exe" from any real-time anti-virus scanning to prevent IDE Module Errors!

The following table describes the error codes that are reported by the QB64 compiler, as well as possible causes and solutions:

QB/64 Error Codes
Code	Description	Common cause/Resolution	QB64 Differences
1	NEXT without FOR	Missing loop end or look for a missing END IF or END SELECT statement.	none
2	Syntax error	Mistyped keyword statements or puctuation errors can create syntax errors.	none
3	RETURN without GOSUB	Place sub-procedure line label after program END or EXIT in a SUB-procedure.	none
4	Out of DATA	A READ has read past the end of DATA. Use RESTORE to reset to data start. .	none
5	Illegal function call	A parameter passed does not match the function type or exceeds certain function limitations. See Illegal Function.	none
6	Overflow	A numerical value has exceeded the limitations of a variable type.	none
7	Out of memory	A module has exceeded the 64K memory limitation of QB. Try breaking the code up to smaller modules.	no limit
8	Label not defined	GOTO or GOSUB tries to branch to a label that doesn't exist.	none
9	Subscript out of range	An array's upper or lower dimensioned boundary has been exceeded.	none
10	Duplicate definition	You can't define a variable twice with DIM, the first time a variable is used it is also defined.	none
11	Division by zero	You cannot divide any value by zero! Even using MOD.	none
12	Illegal in direct mode	A statement (like DIM) in the Immediate window wasn't allowed.	N/A
13	Type mismatch	A SUB or FUNCTION parameter does not match the procedure Declaration.	none
14	Out of string space	A module has exceeded the 32767 text character limit. Use SUB print procedures.	no limit.
16	String formula too complex.	A string formula was too long or INPUT statement requested more than 15 strings	N/A
17	Cannot continue.	The program while debugging has changed in a way that it cannot continue.	no debug
18	Function not defined.	The function used by the program must be defined. Did you include the .bi file while using a library?	none
19	No RESUME.	Use RESUME at the end of the ON ERROR GOTO routine, not RETURN.	none
20	RESUME without error.	RESUME can only be used in an error handler called by ON ERROR GOTO.	none
24	Device timeout.	Use DS0 (DSzero)in the OPEN COM statement to avoid modem timeouts.	none
25	Device fault.	Device not connected or does not exist.	none
26	FOR without NEXT.	Missing loop end or look for a missing END IF or END SELECT statement.	none
27	Out of paper	A printer paper error when using LPRINT.	none
29	WHILE without WEND.	WEND must end a WHILE loop. Otherwise look for missing END IF or END SELECT	none
30	WEND without WHILE	Missing loop end or look for a missing END IF or END SELECT statement.	none
33	Duplicate label	Line numbers or labels cannot be used twice in a procedure.	none
35	Subprogram not defined.	Often occurs when the Quickbasic Library is not used with CALL ABSOLUTE or INTERRUPT or a SUB or FUNCTION procedure has not been created for a CALL.	none
37	Argument-count mismatch	The number of sub-procedure parameters do not match the call.	none
38	Array not defined	Arrays using more than 10 elements must be DIMensioned.	none
40	Variable required.	LEN cannot read literal numerical values. A GET or PUT statement must specify a variable when reading or writing a file opened in BINARY mode.	none
50	FIELD overflow.	A FIELD statement tried to allocate more bytes than were specified for the record length of a random access file.	none
51	Internal error.	An internal malfunction occured in QuickBASIC or QB64.	none
52	Bad file name or number.	The filename must follow the rules for filenames in the OS and use filenumbers from 1 and 255. Use FREEFILE to avoid duplicate OPEN file numbers.	none
53	File not found.	File not in current directory or path. Use _FILEEXISTS to verify file names.	none
54	Bad file mode.	File access mode does not match a current OPEN file procedure.	none
55	File already open.	CLOSE a file to open it in a different mode.	none
56	FIELD statement active.	WRITEME	N/A
57	Device I/O error.	WRITEME	N/A
58	File already exists.	The filename specified in the NAME statement was identical to a file that already exists.	none
59	Bad record length.	Record length exceeds 32767 bytes or is 0	none
61	Disk full.	The amount of data to write to the disk was more than the free space available, remove some files you don't need and try again.	none
62	Input past end of file.	Check for the end of file with EOF when reading from a file.	none
63	Bad record number.	GET read exceeds number of records in a RANDOM file.	none
64	Bad file name	File name contains illegal characters or exceeds 12 characters.	none
67	Too many files	Over 15 files are open in Qbasic.	none
68	Device unavailable.	Device does not exist, busy or not connected.	none
69	Communication-buffer overflow.	WRITEME	N/A
70	Permission denied	A file or port is in use on a network, blocked, read only or locked.	none
71	Disk not ready.	Disk is busy or has no media.	none
72	Disk-media error.	Improper media format or bad data.	none
73	Feature unavailable.	Based on the DOS version available.	none
74	Rename across disks.	WRITEME	N/A
75	Path/File access error.	File or path cannot be accessed.	none
76	Path not found.	Path is not access-able or does not exist. Use _DIREXISTS to check paths.	none
97	(no error message)	Can be used to trigger an error trap event with ERROR 97, nothing else will cause this error, so create your own errors for ON ERROR.	none

N/A means Not Available or Not Applicable to QB64.

QB64 Error Codes
Code	Description	Common cause/resolution	QB Differences
258	Invalid handle	Zero or bad handle values cannot be used by the QB64 procedure creating the error.	N/A

Other Errors

• Syntax errors: QB64 will display most statement syntax and parameter errors in the Status area below the editing area in the IDE. It may also show missing brackets or other syntax punctuation required. Check the keyword's syntax when necessary!

• CPU Memory errors can be created when QB64 loads too many images at one time using _LOADIMAGE or _NEWIMAGE without freeing them. Use _FREEIMAGE to free unused handles. Also may be caused by continually running loops.

• Parameter Type Mismatch: Qbasic's IDE may add DEF statements before any SUB or FUNCTION. QB64(like QB) will change all variable types in subsequent sub-procedures to that default variable type without giving a "Parameter Type Mismatch" warning or adding the proper DEF statement to subsequent procedures! If you do not want that to occur, either remove that DEF statement or add the proper DEF type statements to subsequent procedures. May also affect $INCLUDE procedures!

See also

• ERROR (simulates error), ERR (QB error code number), ERL (closest line number when line numbers are used)
• ON ERROR (calls error handing routine using GOTO only), _ERRORLINE (actual QB64 text code line)

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