Why does my iPhone go into Safe Mode after installing Aeternum / Watchboard?

I'm currently running Cydia jailbreak (from Pangu) on iOS 8 iPhone 5c.
After installing Aeternum (from Cydia) and respringing, my iPhone will enter Safe Mode. While in Safe Mode, I ll go into Cydia, remove Aeternum, respring, and my iPhone will be back out of Sade Mode.
My currently active installations from Cydia I'm using are:
Activator
Anchor
Barrel
betterFivecolumnHomeScreen
DockShift
kiki (current theme)
LockScreenTool
MyStatusBar
Speed Intensifier
Upscale
Watch Notifications
Winterboard

I currently have 101Mb of free RAM space on my iPhone. I have had the same problem with 'Watchboard'. Any suggestions on what I could do or change so I can install and run 'Aeternum' or 'Watchboars' functionally?

I haven't used an iOS device in a while, but I'm assuming that it is because the tweak is not compatible with the iOS version you have.

Some tweaks will freeze your device, so it goes into Safe Mode. Also, if it's a poorly made or cracked tweak, that may be another reason why. It may also be because that tweak interferes with another tweak you already have installed.

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