java.lang.IllegalArgumentException: Material parameter is not defined: BackfaceShadows

I am trying to update my proyect (SAV_v1.8) from 3.0 to 3.1, but I cannot.
I have this exception:

java.lang.IllegalArgumentException: Material parameter is not defined: BackfaceShadows

If anyone I can help me to know I can fix it,…
Thx

(…)ADVERTENCIA: The material parameter is not defined: Minnaert. Ignoring…
mar 16, 2017 1:01:32 AM com.jme3.material.Material read
ADVERTENCIA: The material parameter is not defined: WardIso. Ignoring…
mar 16, 2017 1:01:32 AM com.jme3.material.Material read
ADVERTENCIA: The material parameter is not defined: Minnaert. Ignoring…
mar 16, 2017 1:01:32 AM com.jme3.app.LegacyApplication handleError
GRAVE: Uncaught exception thrown in Thread[jME3 Main,5,main]
java.lang.IllegalArgumentException: Material parameter is not defined: BackfaceShadows
at com.jme3.material.Material.checkSetParam(Material.java:460)
at com.jme3.material.Material.setParam(Material.java:476)
at com.jme3.material.Material.setBoolean(Material.java:615)
at com.jme3.shadow.AbstractShadowRenderer.setMatParams(AbstractShadowRenderer.java:566)
at com.jme3.shadow.AbstractShadowRenderer.postFrame(AbstractShadowRenderer.java:483)
at com.jme3.renderer.RenderManager.renderViewPort(RenderManager.java:1102)
at com.jme3.renderer.RenderManager.render(RenderManager.java:1145)
at com.jme3.app.SimpleApplication.update(SimpleApplication.java:253)
at com.jme3.system.lwjgl.LwjglAbstractDisplay.runLoop(LwjglAbstractDisplay.java:151)
at com.jme3.system.lwjgl.LwjglDisplay.runLoop(LwjglDisplay.java:193)
at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:232)
at java.lang.Thread.run(Thread.java:745)

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do you have custom materials?

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I am using shaderblowlib materials (Disolver and NighVision…these are wonderfull), can be this the problem?

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yes definitely.
Isn’t there a version out there that was updated for 3.1?

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here

add this

then replace all this

with this

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Thank a lot, you for your help. I am going to do it and I tell you.

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It work fine…thx a lot