Can you please help me with code for plugin?

Error: Call to undefined method pocketmine\block\Air::getInputFace()
File: plugins/RedstoneCircuit_dev-32.phar/src/redstone/blockEntities/BlockEntityRedstoneComparator
Line: 69
Type: Error
php help
THIS CRASH WAS CAUSED BY A PLUGIN
BAD PLUGIN: RedstoneCircuit v2.0.0

Code:
[60] return $this->outputSignal;
[61] }
[62]
[63] public function setOutputSignal(int $signal) : void {
[64] $this->outputSignal = $signal;
[65] }
[66]
[67] protected function hasSideUtility() : bool {
[68] $block = $this->getBlock();
[69] $sideBlock = $block->getSide($block->getInputFace());
[70] $tile = $this->getLevel()->getTile($sideBlock);
[71] if ($tile instanceof Container) {
[72] return true;
[73] }
[74]
[75] $id = $sideBlock->getId();
[76] if ($id == 92 || $id == 199) {
[77] return true;
[78] }
[79]

 

Read the code, and use PHP tags. The method

PHP:

 getInputFace(); 

in the class Air does not exist.
Edit
@Diduhless is right, getInputFace() not set xd thanks

 

Error: Call to undefined method pocketmine\block\Air::getInputFace()

 

I have fixed the issue. Here is the (Fixed) File: