Problema ao aplicar temas no primefaces

Ao selecionar o tema ele aplica normalmente, mas ao tentar trocar de pagina dispara a seguinte exceção

Type Exception Report

Message Error loading css, cannot find "theme.css" resource of "primefaces-" library

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

javax.servlet.ServletException: Error loading css, cannot find "theme.css" resource of "primefaces-" library
    javax.faces.webapp.FacesServlet.service(FacesServlet.java:671)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
Root Cause

javax.faces.FacesException: Error loading css, cannot find "theme.css" resource of "primefaces-" library
    org.primefaces.renderkit.HeadRenderer.encodeCSS(HeadRenderer.java:149)
    org.primefaces.renderkit.HeadRenderer.encodeBegin(HeadRenderer.java:81)
    javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:865)
    javax.faces.component.UIComponent.encodeAll(UIComponent.java:1854)
    javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
    com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:458)
    com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:134)
    com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)
    com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)
    javax.faces.webapp.FacesServlet.service(FacesServlet.java:659)

Meu web-xml

    <context-param>
        <param-name>primefaces.THEME</param-name>
        <param-value>#{temaBean.tema}</param-value>
    </context-param>

Meu bean

@ManagedBean
@SessionScoped
public class TemaBean {
    private String tema = "bootstrap";

    public String getTema() {
        return tema;
    }

    public void setTema(String tema) {
        this.tema = tema;
    }
    public String[] getTemas() {
        return new String[] { "afterdark", "afternoon", "afterwork", "aristo",
                "black-tie", "blitzer", "bluesky", "bootstrap", "casablanca",
                "cupertino", "cruze", "dark-hive", "delta", "dot-luv",
                "eggplant", "excite-bike", "flick", "glass-x", "home",
                "hot-sneaks", "humanity", "le-frog", "midnight", "mint-choc",
                "overcast", "pepper-grinder", "redmond", "rocket", "sam",
                "smoothness", "south-street", "start", "sunny", "swanky-purse",
                "trontastic", "ui-darkness", "ui-lightness", "vader" };
        }

}

Meu template

<p:themeSwitcher id="basic" style="width:165px" value="#{temaBean.tema}">
            <f:selectItem itemLabel="Aristo" itemValue="aristo" />
            <f:selectItem itemLabel="Vader" itemValue="vader" />
            <f:selectItem itemLabel="Bootstrap" itemValue="bootstrap" />
             <f:selectItem itemLabel="Omega" itemValue="omega" />
            <f:ajax/>
        </p:themeSwitcher>

Adicionei o jar de all-themes-1.0.10 na pasta lib dentro de web-inf. Mas sempre quando navego de pagina dispara essa exceção