Applications generated by Free Pascal might generate run-time errors when certain abnormal
conditions are detected in the application. This appendix lists the possible run-time errors and
gives information on why they might be produced.
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1 Invalid function number
- An invalid operating system call was attempted.
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2 File not found
- Reported when trying to erase, rename or open a non-existent file.
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3 Path not found
- Reported by the directory handling routines when a path does not exist
or is invalid. Also reported when trying to access a non-existent file.
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4 Too many open files
- The maximum number of files currently opened by your process
has been reached. Certain operating systems limit the number of files which can be
opened concurrently, and this error can occur when this limit has been reached.
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5 File access denied
- Permission to access the file is denied. This error might be caused by one of
several reasons:
- Trying to open for writing a file which is read-only, or which is actually a directory.
- File is currently locked or used by another process.
- Trying to create a new file, or directory while a file or directory of the same name
already exists.
- Trying to read from a file which was opened in write-only mode.
- Trying to write from a file which was opened in read-only mode.
- Trying to remove a directory or file while it is not possible.
- No permission to access the file or directory.
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6 Invalid file handle
- If this happens, the file variable you are using is trashed; it indicates that
your memory is corrupted.
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12 Invalid file access code
- Reported when a reset or rewrite is called with an invalid FileMode
value.
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15 Invalid drive number
- The number given to the Getdir or ChDir function specifies a
non-existent disk.
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16 Cannot remove current directory
- Reported when trying to remove the currently active
directory.
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17 Cannot rename across drives
- You cannot rename a file such that it would end up on
another disk or partition.
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100 Disk read error
- An error occurred when reading from disk. Typically happens when you try
to read past the end of a file.
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101 Disk write error
- Reported when the disk is full, and you’re trying to write to
it.
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102 File not assigned
- This is reported by Reset, Rewrite, Append, Rename and Erase, if you
call them with an unassigned file as a parameter.
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103 File not open
- Reported by the following functions : Close, Read, Write, Seek,
EOf, FilePos, FileSize, Flush, BlockRead, and BlockWrite if the file is not
open.
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104 File not open for input
- Reported by Read, BlockRead, Eof, Eoln, SeekEof or
SeekEoln if the file is not opened with Reset.
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105 File not open for output
- Reported by write if a text file isn’t opened with Rewrite.
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106 Invalid numeric format
- Reported when a non-numeric value is read from a text file, and a
numeric value was expected.
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150 Disk is write-protected
- (Critical error)
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151 Bad drive request struct length
- (Critical error)
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152 Drive not ready
- (Critical error)
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154 CRC error in data
- (Critical error)
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156 Disk seek error
- (Critical error)
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157 Unknown media type
- (Critical error)
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158 Sector Not Found
- (Critical error)
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159 Printer out of paper
- (Critical error)
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160 Device write fault
- (Critical error)
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161 Device read fault
- (Critical error)
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162 Hardware failure
- (Critical error)
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200 Division by zero
- The application attempted to divide a number by zero.
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201 Range check error
- If you compiled your program with range checking on, then you can get
this error in the following cases:
- An array was accessed with an index outside its declared range.
- Trying to assign a value to a variable outside its range (for instance an enumerated
type).
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202 Stack overflow error
- The stack has grown beyond its maximum size (in which case the size
of local variables should be reduced to avoid this error), or the stack has become corrupt.
This error is only reported when stack checking is enabled.
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203 Heap overflow error
- The heap has grown beyond its boundaries. This is caused when
trying to allocate memory explicitly with New, GetMem or ReallocMem, or when a class or
object instance is created and no memory is left. Please note that, by default, Free Pascal
provides a growing heap, i.e. the heap will try to allocate more memory if needed. However, if
the heap has reached the maximum size allowed by the operating system or hardware, then
you will get this error.
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204 Invalid pointer operation
- You will get this if you call Dispose or Freemem with an invalid
pointer (notably, Nil).
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205 Floating point overflow
- You are trying to use or produce real numbers that are too
large.
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206 Floating point underflow
- You are trying to use or produce real numbers that are too
small.
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207 Invalid floating point operation
- Can occur if you try to calculate the square root or
logarithm of a negative number.
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210 Object not initialized
- When compiled with range checking on, a program will
report this error if you call a virtual method without having called its object’s
constructor.
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211 Call to abstract method
- Your program tried to execute an abstract virtual method.
Abstract methods should be overridden, and the overriding method should be
called.
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212 Stream registration error
- This occurs when an invalid type is registered in the objects
unit.
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213 Collection index out of range
- You are trying to access a collection item with an invalid
index (objects unit).
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214 Collection overflow error
- The collection has reached its maximal size, and you are trying
to add another element (objects unit).
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215 Arithmetic overflow error
- This error is reported when the result of an arithmetic
operation is outside of its supported range. Contrary to Turbo Pascal, this error is
only reported for 32-bit or 64-bit arithmetic overflows. This is due to the fact
that everything is converted to 32-bit or 64-bit before doing the actual arithmetic
operation.
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216 General Protection fault
- The application tried to access invalid memory space. This can
be caused by several problems:
- Dereferencing a nil pointer.
- Trying to access memory which is out of bounds (for example, calling move with
an invalid length).
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217 Unhandled exception occurred
- An exception occurred, and there was no exception
handler present. The sysutils unit installs a default exception handler which catches all
exceptions and exits gracefully.
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219 Invalid typecast
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Thrown when an invalid typecast is attempted on a class using the as operator. This error is
also thrown when an object or class is typecast to an invalid class or object and a virtual
method of that class or object is called. This last error is only detected if the -CR compiler
option is used.
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222 Variant dispatch error
- No dispatch method to call from variant.
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223 Variant array create
- The variant array creation failed. Usually when there is not enough
memory.
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224 Variant is not an array
- This error occurs when a variant array operation is attempted on a
variant which is not an array.
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225 Var Array Bounds check error
- This error occurs when a variant array index is out of
bounds.
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227 Assertion failed error
- An assertion failed, and no AssertErrorProc procedural variable
was installed.
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229 Safecall error check
- This error occurs is a safecall check fails, and no handler routine is
available.
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231 Exception stack corrupted
- This error occurs when the exception object is retrieved and
none is available.
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232 Threads not supported
- Thread management relies on a separate driver on some operating
systems (notably, Unixes). The unit with this driver needs to be specified on the uses clause
of the program, preferably as the first unit (cthreads on unix).