FieldException: Attempt to create a field of unknown type....

If I install uc_multiprice by checking the box for both Multiprice and Multiprice Field, then click Save configurations.
I will see this error. Same error on both uc_multiprice 7.x-2.1 and uc_multiprice 7.x-2.0.

FieldException: Attempt to create a field of unknown type <em class="placeholder">uc_multiprice</em>. in field_create_field() (line 110 of /home/portabl/public_html/uber/modules/field/field.crud.inc).

What is interesting is I don't see this error if I enable these two sub-modules one by one.