How to fix "Cannot use this in a static context" in a static code block?

Question

In my class there is a static code block, and in src folder there is a propertie file so I use below code to read it.

static 
{
   InputStream iStream = null;
   try {
    
    iStream = this.getClass().getClassLoader()
                             .getResourceAsStream("config.properties");
    if(iStream == null){
     throw new IOException("File not found");
    }
    properties.load(iStream);
   } catch (IOException e) {
    e.printStackTrace();
   }
}

then there is error "Cannot use this in a static context". So how to fix it? Thx