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The error message "insmod error: inserting './hello.ko': -1 Invalid module format" indicates that there is a problem inserting the kernel module file (hello.ko) into the kernel. The -1 error code suggests that the problem is related to an invalid module format, which could mean a mismatch between the module and kernel versions, a corrupted or improperly compiled module, or an issue with loading the dependencies. The specific cause of the error would need further investigation to determine.