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[OfficialPixelBrush]

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FATAL ERROR in
action number 1
of Step Event0
for object obj_htme:

local variable inst_object(100007, -2147483648) not set before reading it.
at gml_Script_htme_syncSingleVarGroup (line 119) - buffer_write(self.buffer, buffer_u16, inst_object);
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stack frame is
gml_Script_htme_syncSingleVarGroup (line 119)
called from - gml_Script_htme_syncInstances (line 31) - htme_syncSingleVarGroup(group,all);
called from - gml_Script_htme_step (line 29) - htme_syncInstances();
called from - gml_Object_obj_htme_StepNormalEvent_1 (line 2) - htme_step();

[The-any-Key]

The error show that you have manually removed a synced object but you did not call mp_unsync before or you mp_unsync it on the wrong side.

To destroy a synced object you call: mp_unsync() and then instance_destroy(). This means you can not have the mp_unsync() inside the destroy event code.

You can also only call mp_unsync() on the machine that created the object. Ex: P1 create and sync his own obj_player. This means only P1 can unsync and destroy it. After P1 unsync and destroy his obj_player. GMnet will remove it from the other players automatically.

To allow other players to destroy objects you need to send a RPC to force the "owner" of the object to destroy it. Or simulate (ex hit and hurt by something) and make sure the "owner" destroy the object.

[OfficialPixelBrush]

It seems the Manual Page for RPCs is down https://gmnet-engine.org/manual/engine/tutorial/17_rpc
Mind helping on that front?

[The-any-Key]

https://youtu.be/P1qJvUKj6Y0