TypeError: 'str' object is not callable when using CreateShader()

[sheilan102]

Hello, I'm creating a plugin and part of what it does is create Redshift materials, but I seem to be getting this error when using the CreateShader() function. I tested graphos' example with the TextureSampler and it worked perfectly, but when I'm trying to use it within my fuction I'm getting an error.

Here's my function -

def createRedshiftMaterial(op,materials,name,texpath):
	rs = Redshift()
	RSMATERIAL_ID = 1000

	# Get BaseDocument
	doc = c4d.documents.GetActiveDocument()

	# Create RS Material
	c4d.CallCommand(1036759, 1000)

	mat = doc.SearchMaterial("RS Material")

	# Name it
	mat.SetName(name)

	#Assign Material
	rs.SetMat(doc.GetFirstMaterial())

	#Get default material node and output node
	listNode = rs.GetAllNodes()
	MatNode = None
	OutPutNode = None
	for node in listNode:
		if node.GetType() == "Output":
			OutPutNode = node
		elif node.GetType() == "Material":
			MatNode = node

	if not MatNode or not OutPutNode:
		return

	for texture in materials[name].keys():
		position = 0,0
		if texture == "Color Map":
			position = 200,500
			mat_input = c4d.REDSHIFT_SHADER_MATERIAL_DIFFUSE_WEIGHT

    		# Create image path
		#imagePath = "%s\\%s.tga" %(str(texpath),materials[name][texture])

		if position[0] != 0:
			TextureNode = rs.CreateShader(rs.TexSampler, x=20, y=200)
			#TextureNode[c4d.REDSHIFT_SHADER_TEXTURESAMPLER_TEX0, c4d.REDSHIFT_FILE_PATH] = imagePath

			#Expose a paramter of the material
			MatNode.ExposeParameter(mat_input, c4d.GV_PORT_INPUT)

			#Connect Texture shader to the material
			rs.CreateConnection(TextureNode, MatNode, 0, 0)

			#Connect material shader to the output
			rs.CreateConnection(MatNode, OutPutNode, 0, 0)

			c4d.EventAdd()

  	# Create Texture-Tag for our object
	textag = c4d.TextureTag()
	# Assign our material to the tag
	textag.SetMaterial(mat)
	# Set Texture-Tag Projection
	textag[c4d.TEXTURETAG_PROJECTION]=c4d.TEXTURETAG_PROJECTION_UVW
    	# Assign material to our object
	op.InsertTag(textag)
	doc.InsertMaterial(mat)
	op.Message(c4d.MSG_UPDATE)
	c4d.EventAdd()

The error -

TextureNode = rs.CreateShader(rs.TexSampler, x=20, y=200)
File "<string>", line 350, in CreateShader
File "<string>", line 183, in _TestProperty
TypeError: 'str' object is not callable