Need help disabling boot picker(Opencore)

Okay, as you can see, I'm new to Hackintosh reddit and also a non-native English speaker. So I'm sorry if I did something against the rules.

I made my HP Spectre(laptop) a mostly-working Hackintosh with Opencore, so I would like to do some cosmetic fixes now. One of them is making it boot directly into Apple logo, instead of showing boot picker for some time. I know that I have to set 'showPicker' as false in config.plist.

However, when I change it to true to false(and change absolutely nothing else), I cannot boot. The error message shows

"Waiting on <dict ID="0"><key>IOProviderClass</key><string ID="1">IOResources</string><key>IOResourceMatch</key><string ID="2">boot-uuid-media</string></dict>"

When I change false to true again, I have no issues booting.

When I've searched, results showed me that this error is related to USB mapping or Opencore APFS drive recognition. However, I cannot understand why is that a problem. It boots perfectly fine when I have boot picker. Why should it display this kind of message?

If anyone can help me in this problem, I would appreciate it. Thanks for reading.

My laptop specs:

HP Spectre x360 Late 2017i5-8250u8GB RAMIntel UHD 620 GraphicsSamsung 970 EVO plus 1TBRealtek AudioIntel Dual Band Wireless AC 8265

submitted by /u/Alternative0
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