https://devzone.nordicsemi.com/f/nordic-q-a/49362/running-ecdh-and-aes256-ctr-in-the-same-projectHi, I successfully tested ecdh and aes256 in seperate projects but I want to combine them. This is my code: Problem is that when i call the ecc functions this happens: &lt;error&gt; app: Error 0x8516: An internal error occurred when calling thisen-USTelligent Community 13Thu, 04 Jul 2019 13:46:28 GMThttps://devzone.nordicsemi.com/thread/196589?ContentTypeID=1Thu, 04 Jul 2019 13:46:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c02d0348-7fc4-4f76-ac0f-2aa7e8d6478dAndreasF<p>Hi.</p> <p>Can you check which function within <strong>nrf_crypto_ecc_key_pair_generate()</strong> that returns the error? By stepping through it.</p> <p>Best regards,</p> <p>Andreas</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/196522?ContentTypeID=1Thu, 04 Jul 2019 11:49:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6da8ada0-392f-4593-a268-80ae844e3cb8AptusBE<p>Yes, the aes functions are&nbsp;OK and when i debug I see the message decrypted so that&#39;s fine. The first ecc function returns an error</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/196521?ContentTypeID=1Thu, 04 Jul 2019 11:47:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e6452268-bd0f-4b77-9751-d53405deb36eAndreasF<p>&nbsp;Hi.</p> <p><strong>NRF_ERROR_CRYPTO_INTERNAL </strong>can come from a few of these function calls. Have you tried to debug and see which function returns this error?</p> <p>Best regards,</p> <p>Andreas</p><div style="clear:both;"></div>