Type error while dropping new decrypt node

[yNosGR]

This might just be a noob problem, but I'm on a fresh node-red install(v4.02) and trying to drop out a decrypt node and i'm getting this error. I was able to drop out a decode, and I am seeing traffic coming in from the mqtt in, just cant decrypt it yet. Please let me know if I'm doing something wrong, don't have some other package installed, etc.