R write a spatialpolygon simplified with gSimplify

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I'm using gSimplify (rgeos package) to simplify the geometries of a shapefile.The funcion works good, but now I can't write the output in a new shapefile.I tried some ways:

writeOGR(simplyshape, file, driver="ESRI Shapefile",layer = 'test')I get:

obj must be a SpatialPointsDataFrame, SpatialLinesDataFrame or SpatialPolygonsDataFrame

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and with:

writePolyShape(simplyshape, file)I get:

Error: is(x, "SpatialPolygonsDataFrame") is not TRUE

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