active KVUO missing library error

[hm2118]

when loading KVUO in Plane 11 , I get this error:

1:19:09.305 E/SYS: | The following scenery package has a problem and will therefore not be loaded:
1:19:09.305 E/SYS: | Custom Scenery/Orbx_A_KVUO_Pearson_Field/
1:19:09.305 E/SYS: | It requires an additional library scenery package that is not installed, or it is missing some of its files.

 

I looked in xplane log, it appears to be this:

1:19:09.305 E/SCN: Custom Scenery/Orbx_A_KVUO_Pearson_Field/Earth nav data/+40-130/+45-123.dsf:
1:19:09.305 E/SCN: The art asset 'iby_lib/forests/iby_city_trees_decid.for' could not be found.
1:19:09.305 E/SCN: DSF canceled due to missing art assets, file=Custom Scenery/Orbx_A_KVUO_Pearson_Field/Earth nav data/+40-130/+45-123.dsf, err=15 (dsf_ErrCanceled).
1:19:09.305 E/SCN: WARNING: got error on DSF load for scenery file 45, -123, Custom Scenery/Orbx_A_KVUO_Pearson_Field/
1:19:09.305 I/SCN: DSF load time: 2232 for file Custom Scenery/Orbx_B_KVUO_Pearson_Field_AGN/Earth nav data/+40-130/+45-123.dsf (0 tris)

 

Any idea how to resolve this issue.

Thanks