ERROR_CANTREAD - 1012 (0x3F4)
The configuration registry key could not be read.
Updated: Feb 21, 2026
Introduction
ERROR_CANTREAD (1012, 0x3F4) indicates that the system encountered an issue while attempting to read a configuration registry key. This error is generic in nature and does not specify the exact cause or context of the failure.
Technical Meaning
The ERROR_CANTREAD return code signifies that a function call intended to read data from the Windows Registry failed due to an inability to access the specified registry key. The specific operation, such as reading a value or querying a key, was not successful.
Error Details
This error can occur in various scenarios where registry operations are performed by applications or system components. It is important to note that this error does not provide detailed information about why the read operation failed; it only indicates that the attempt was unsuccessful.
Usage Context
ERROR_CANTREAD can be encountered in a wide range of situations, including but not limited to:
- Application configuration settings retrieval
- System initialization and startup processes
- Custom registry operations performed by third-party software
Developer Interpretation
When encountering ERROR_CANTREAD, developers should interpret it as an indication that the specified registry key could not be accessed or read. This error does not provide specific details about the failure, such as whether the key was missing, if there were insufficient permissions, or if the operation was invalid in some other way.
Related Errors
ERROR_FILE_NOT_FOUND(2)ERROR_ACCESS_DENIED(5)ERROR_INVALID_PARAMETER(87)ERROR_REGISTRY_CORRUPT(1930)
FAQ
Q: What does the ERROR_CANTREAD error mean?
A: The system was unable to read a specified registry key. This is a generic error and does not provide specific details about why the operation failed.
Q: Can this error be related to file system issues?
A: No, this error specifically relates to registry operations and not file system issues.
Summary
ERROR_CANTREAD (1012, 0x3F4) is a generic return code indicating that the system was unable to read a specified registry key. This error does not provide specific details about the failure but indicates that the operation intended to retrieve data from the registry was unsuccessful.