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I have an error when linking a library made with swkbd

Code:

const char *CMenuField::Key( int key, int down )
if ( key == K_ENTER )
{
Result rc=0;
char con_input[50] = {0};

SwkbdConfig kbd;
rc = swkbdCreate(&kbd, 0);

if (R_SUCCEEDED(rc)) {
swkbdConfigMakePresetDefault(&kbd);

rc ...