The items.csv file needs to be updated to include aliases for the 1.10 blocks. The current version is only updated up to 1.9.

For ease, I'll list the 5 new blocks below:
STRUCTURE_BLOCK - id 255
MAGMA - id 213
NETHER_WART_BLOCK - id 214
RED_NETHER_BRICK - id 215
BONE_BLOCK - id 216

There are also several new spawn eggs but they don't have data values.

This has been introduced in 3a6da5c. You can grab the feature from build 423 on the CI server.