A question about Ardor3d and GLSL

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Java

OpenGL

I am doing with a Open code about a game.
When loading the game a exception was threw about.
The exception is this:

com.ardor3d.util.Ardor3dException: Error compiling GLSL shader: Vertex shader failed to compile with the following errors:

ERROR: 0:29: 'mod' : signature matching could not take type conversions into account in GLSL1.10
ERROR: 0:30: 'mod' : signature matching could not take type conversions into account in GLSL1.10

ERROR: 2 compilation errors. No code generated.

Please help.