The first plugin has the dhudmessage file included in the .sma itself. Remove lines 13 and 214 to 319.
The second plugin has a slightly different problem. "dhudmessage.inc" uses an additional argument in the "set_dhudmessage" function, while the one built in AMXX doesn't have this argument, so you get an error saying that the number of arguments doesn't match the definition.
To fix this, simply remove the last argument from the functions on lines 88 and 93. Both of them have the argument "false".
PS: you're using an old 1.8.3 dev-build. The current development version is AMXX 1.9. You should consider updating -
https://www.amxmodx.org/downloads-new.php
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