invalid-meta openlayers is missing "main" entry in bower.json

[pdorgambide]

bower info openlayers
bower openlayers#* not-cached git://github.com/openlayers/openlayers.git#*
bower openlayers#* resolve git://github.com/openlayers/openlayers.git#*
bower openlayers#* checkout master
bower openlayers#* progress Checking out files: 59% (720/1219)
bower openlayers#* progress Checking out files: 70% (854/1219)
bower openlayers#* progress Checking out files: 77% (939/1219)
bower openlayers#* progress Checking out files: 86% (1049/1219)
bower openlayers#* invalid-meta openlayers is missing "main" entry in bower.json
bower openlayers#* invalid-meta openlayers is missing "ignore" entry in bower.json
bower openlayers#* resolved git://github.com/openlayers/openlayers.git#1e1bd1b224

When I try add openlayers to a vendor file generated by gulp-concat-vendor show this error:
Skipping library @ bower_components\openlayers. Bower.js is missing 'main' property.