call to bip39_mnemonic_from_bytes in libwally-core returns NULL

call to bip39_mnemonic_from_bytes in libwally-core returns NULL

what am I doing wrong? it always returns with error -2... I included libwallycore to my project and my IDE tells me it it is available after I also did include <wally_bib39.h>

I tried mainting a wordlist myself but then I run into even more mistakes so I guess I am missusing the API. Ca anyone help out pls?

static void display_mnemonic_word_list(void){
    char **mnemonic_secret=NULL;
    //wordlist_init(bip39_wordlist)
    const unsigned char myArray[] = { 0x00, 0x11, 0x22, 0x11, 0x22, 0x11, 0x22, 0x11, 0x22, 0x11, 0x22, 0x11, 0x22, 0x11, 0x22, 0x11, 0x22, 0x11, 0x22, 0x11, 0x22, 0x11, 0x22, 0x11, 0x22, 0x11, 0x22, 0x11, 0x22, 0x11, 0x22, 0x11, 0x22,  0x33 };
    int ret = bip39_mnemonic_from_bytes(NULL,myArray,32,mnemonic_secret);
    if (ret!=WALLY_OK){
        printf("mnemonic did not work. error: %d",ret);
    }
    printf("HSM: your should remember / write down the following words do recover your funds!");
    if (mnemonic_secret){
        int i = 0;
        while ( *mnemonic_secret )
            printf( "%d. %s", ++i, *mnemonic_secret++ );
    }
}
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