Error Codes KeePass error codes and their meanings.

Error Code	Name	User	Description
0x00000000	Unknown		An unknown error occured. KeePass uses this error code internally and the user should never see this error.
0x00000001	Success		No error occured. Everything worked perfectly.
0x00000002	Invalid Parameter		A function within KeePass has received an invalid parameter. This should never happen.
0x00000003	Out of Memory		The operating system didn't grant KeePass enough memory. The current operation was cancelled. The database maybe is in a broken state and should not be saved.
0x00000004	Invalid Key		The user-provided master key (master password / key file) for the database was incorrect, or the database is corrupted. Make sure the master password and/or the key file is correct. If you are absolutely sure that the master password / key file is correct, then probably the file is corrupted (maybe you accidently removed the USB stick from the computer without unmounting it). In this case, try the Repair Database functionality of KeePass.
0x00000005	File Access Error: Read File		The operating system (Windows) didn't grant KeePass read access to the specified database file. Note that this doesn't mean that the database is corrupted or something like that; KeePass just cannot get read access to the file. Make sure that you can read the file.
0x00000006	File Access Error: Write File		The operating system (Windows) didn't grant KeePass write access to the specified database file. Try saving the database to a different location, where the administrators of your network have granted you write access to.
0x00000007	File Error: Read		An error occured while reading the database or key file. This can happen if you for example open a big database from USB stick and remove the stick while KeePass is reading the file. Make sure KeePass can access the complete file and don't remove the device before KeePass has read it completely.
0x00000008	File Error: Write		An error occured while writing the database or key file. This can happen if you for example save a big database to USB stick and remove the stick while KeePass is writing the file. Make sure there is enough free space left on the target device and don't remove the device before KeePass has written the file completely. Make sure you correctly unmount the device (USB stick).
0x00000009	Invalid Random Source		This is an internal cryptographic error. The random source, that is used to generate random numbers, is invalid. This means that it produces non-random values and therefore the security (secrecy) of your database cannot be guaranteed; therefore the operation was aborted. This error should never occur. If you see this error code, please submit a bug report (see below).
0x0000000A	Invalid File Structure		The structure of the current database file is invalid. This can either happen if the user-supplied master key (master password / key file) is invalid or if the file is corrupted. If you are sure that the key is correct, try the Repair Database functionality.
0x0000000B	Cryptographic Error		An internal cryptographic error occured. One of the cryptographic components cannot be initialized, tested and/or returned an error.
0x0000000C	Invalid File Size		The file size isn't valid. This means that the file is corrupted.
0x0000000D	Invalid File Signature		The file's signature is invalid. This means that the file is corrupted and/or not a file that KeePass can read.
0x0000000E	Invalid File Header		The file's header is invalid. The file could be corrupted, could have been created by a newer KeePass version, or could not be a KeePass file at all.
0x0000000F	File Access Error: Read Key		The operating system (Windows) didn't grant KeePass read access to the specified key file or it doesn't exist. Note that this doesn't mean that the key file is corrupted, KeePass just cannot get read access to the file. Make sure the media that contains the key file is inserted and that KeePass has the right to access it (check file access rights, ensure that no other application is blocking the file, ...). In case you're selecting the key file's drive (i.e. not specifying it manually), have a look for the "pwsafe.key" file. See the master key documentation for more information about using key files.
0x00000010	Prov: Invalid Key		The key provider plugin did not supply a valid key.
0x00000011	File Error: Verify		The data that has been sent to the disk/drive does not match the data that is now stored on the disk/drive, i.e. the file was corrupted by something. See error 0x00000008.
0x00000012	KDBX File		The file you tried to open is in KDBX format. KDBX files are only supported by KeePass 2.x. Either use KeePass 2.x, or use the 'Export' feature of KeePass 2.x to migrate the file to a KeePass 1.x KDB file.
0x00000013	System Error		A user-level error occured and the system provided the detailed description shown in the error message box.
0x00000014	Database Empty		The database is empty. KeePass refuses to load/save empty databases.

User:

: This error is not a bug. KeePass has failed to perform some operation and you can fix this "error" yourself. For example, when you entered an invalid key for your database, failing to open the database isn't a bug.

: This error is a bug. You should never see this error. Please submit a Bug Report.