You have function main which is a function that is called when the engine starts. In there you need to call level_load(level_name)
Actions are defined outside of the function anywhere in the code, they look like this:
Code:

action test
{
// code goes here
  while (1)
  {
    wait(1);
  }
}

You can't make an action inside a function, it must be outside, anywhere you want.

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