Fixes

src/Cache.php

@@ -0,0 +1,24 @@
+<?php
+namespace PSC\Library\Calc;
+
+class Cache {
+    private static $instance = null;
+    private $cache = [];
+
+    private function __construct() {}
+
+    public static function getInstance() {
+        if (self::$instance === null) {
+            self::$instance = new Cache();
+        }
+        return self::$instance;
+    }
+
+    public function set($key, $value) {
+        $this->cache[$key] = $value;
+    }
+
+    public function get($key) {
+        return $this->cache[$key] ?? null;
+    }
+}

src/Calc/Valid.php

@@ -12,6 +12,7 @@ use PSC\Library\Calc\Option\Type\Base;
 use PSC\Library\Calc\Option\Type\Checkbox;
 use PSC\Library\Calc\Option\Type\Input;
 use PSC\Library\Calc\Option\Type\Select;
+use PSC\Library\Calc\Option\Type\ColorDBSelect;
 
 class Valid
 {