You forgot a closing parenthesis in your line of code. It has to be
code:
$Update = GetFileTime(@LDRIVE + "\EPOAgent\AgentDB\Log\default.htm")

You can display the error message with
code:
? @ERROR - @SERROR

Also does it work for
code:
$Update = GetFileTime("C:\EPOAgent\AgentDB\Log\default.htm")

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There are two types of vessels, submarines and targets.