What is the name of the assembly line machine that is causing the error in question? Is it possible to identify the precise nature of the material that is causing the error? What measures can be taken to prevent a similar error from occurring in the future?
To fix the error described as Alarm: initial startup, there is material in the assembly line, you'll need to identify the source of the material and clear it from the assembly line. This may require adjusting your manufacturing processes or stopping production