If you are encountering the error when doing insmod, after a completely-successful compile, then the problem is most-likely that the driver is looking for a symbol in the kernel's symbol-table and cannot find it.
It may be, for example, that this module requires certain support to be built-in to the kernel, or perhaps provided by some other module that, as it turns out, isn't there (yet).
The place to begin is at the support-site for whatever module it is...
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