Hi Milan,
Make sure that you’ve done the following,
1) Pull up the address bit of both encoder and decoder
2) Pull up the data bits also
It may work some people eventhough without it, but somehow!!
3) Make sure the each address bits are at the same voltage (logic 0 or 1) on both encoder and decoder.
Also keep in mind that your module can transmit data atmost 3kbps only.