Natalia,
We are talking about "Open Mobile Map (mmpk)" sample, correct?
Technically if you put the mmpk file in the right folder and change the filename at the right place in the code, it should work. Just for testing purposes, we have another mmpk file in the sample called "PalmSprings.mmpk", let's try to switch "Yellowstone.mmpk" to "PalmSprings.mmpk" in your sample. This should work, I just tried it, see screenshot below. After this is successful, you can change it to your own mmpk file.
Thank you,
Erwin.