URDF Problems after switching to ROS Noetic

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Hey! I am working with a Gazebo Simulation and it works on ROS Kinetic and Melodic without problems. So, i switch on a new machine with Ubuntu 20.04 and ROS Noetic and with this changing some different problems appears. I am working in a Container and if i only want to load the empty world in Gazebo with my robot model via a launch, the following errors occur: Error: [parser_urdf.cc:3193] Unable to call parseURDF on robot model Error:[parser.cc:488] parse as old deprecated model file failed.

There seems to be a problem with loading the URDF. The same xacro file works fine in kinetic and melodic. the urdf_checker throws out errors that make no sense to me. It seems that the macros are not being called, but the syntax is correct, because it works well in the other distributions.

Thanks in advance!

First file:
<?xml version="1.0"?>
<robot name="robot" xmlns:xacro="http://www.ros.org/wiki/xacro">
    <xacro:property name="param1" value="1"/>
    <xacro:property name="param2" value="2"/>
    <xacro:include filename="$(find package)/urdf/mac.xacro"/>
    <xacro:base_link />
</robot>

Second file:
<?xml version="1.0"?>
 <robot name="robot" xmlns:xacro="http://www.ros.org/wiki/xacro">
  <xacro:macro name="base_link">
   <link name="base_link">
    <visual>
     <geometry>
      <box_size="0.01 0.01 0.01" />
     </geometry>
    </visual>
  </link>

 <gazebo reference="base_link">
   <material name="blue" />
 </gazebo>
</robot>