The error message while running a C program in Linux is “invalid argument.”

“Invalid argument” error message typically indicates that the parameters or options provided to a C program are incorrect or invalid, potentially caused by a variety of reasons.

1. Error in parameters: Check if you have provided the correct parameters. Ensure that the format, order, and syntax of the parameters are correct. Sometimes, the program may require specific types of parameters or options, such as file names or paths. Make sure you are providing the correct parameter types.
2. Incorrect option: Make sure to provide the correct option if you are using options in the command line, such as “-h” or “–help”. Sometimes, options may need to be used together with other options or parameters. Read the program’s documentation or help information to understand the correct way to use options.
3. Incorrect file or path: Make sure the file path is correct and that you have permission to access the file if the program needs to read or write to a file. If the file does not exist or cannot be accessed, the program may report an “invalid argument” error.
4. Library or dependency error: If the program relies on specific libraries or dependencies, make sure that these libraries or dependencies are correctly installed and that you are using the correct version of the library. Sometimes, using the wrong library or version can also result in an “invalid argument” error.

If you are unsure of the specific cause of the error, you can try the following steps to resolve the issue:

1. Carefully review the documentation or help information of the program to ensure you have a clear understanding of how to use the program, its parameters, and options.
2. Check to ensure that the parameters and options you have provided are correct, and make sure that you have permission to access the related files or paths.
3. Make sure you have properly installed the necessary libraries or dependencies, and are using the correct version.
4. Simplify the parameters and options of the program, gradually add and test them to identify the specific parameter or option causing errors.
5. Recompile the program to ensure there are no compilation errors or warnings, and make sure the generated executable matches the operating system and architecture you are running on.

If the issue persists, you can try searching online for relevant error information and solutions, or seek help from the developer or community of the program.