Uncaught PHP Exception TypeError: "implode(): Argument #1 ($array) must be of type array, string given" at bootstrap_library.module line 149

Proposed resolution

//On line 149 change to
function _bootstrap_library_array_to_string($array) {
if (!is_array($array)) {
$array = [$array];
}
return implode("\r\n", $array);
}