Graphics

Here is script

dim mat as XpMaterial
dim shader as XpBaseShader
dim path as String = engine.ProjectPath & "Video\Teams\TITLECARD\" & text & ".avi"

if engine.getMaterialByName("TC Home", mat) then
  if mat.getShaderByName("Video", shader) then
    if My.Computer.FileSystem.FileExists(path) then
      shader.setFileName(path)
      shader.reloadFile()
    End if
  End if
End if

Your variable "text" is not defined.