Can't add to Meteor 2.6 project

[tab00]

When I try meteor add peerlibrary:user-extra I get these error messages:

=> Errors while adding packages:

While selecting package versions:
error: Conflict: Constraint accounts-base@1.4.3 is not satisfied by accounts-base 2.2.1.
Constraints on package "accounts-base":
.
.
.

• accounts-base@1.4.3 <- peerlibrary:user-extra 0.5.0

Please update the code to make it compatible with the latest release of Meteor. Thank you.