Fix initialization order of image sequencer to remove an error of unknown token

src/engine/openspaceengine.cpp

@@ -103,7 +103,6 @@ OpenSpaceEngine::OpenSpaceEngine(std::string programName)
 {
 	SpiceManager::initialize();
 	Time::initialize();
-	ImageSequencer2::initialize();
 	FactoryManager::initialize();
 	ghoul::systemcapabilities::SystemCapabilities::initialize();
 }
@@ -222,6 +221,8 @@ bool OpenSpaceEngine::create(
 	FileSys.createCacheManager(absPath("${" + constants::configurationmanager::keyCache + "}"));
 	_engine->_console->initialize();
 
+    ImageSequencer2::initialize();
+
 	// Register the provided shader directories
 	ghoul::opengl::ShaderObject::addIncludePath("${SHADERS}");
 

src/util/imagesequencer2.cpp

@@ -46,8 +46,7 @@ namespace openspace {
 ImageSequencer2* ImageSequencer2::_instance = nullptr;
 
 ImageSequencer2::ImageSequencer2()
-    : _defaultCaptureImage(absPath("${OPENSPACE_DATA}/scene/common/textures/placeholder_blank.png"))
-    , _latestImage()
+    : _latestImage()
     , _hasData(false)
 {}
 
@@ -58,6 +57,7 @@ ImageSequencer2& ImageSequencer2::ref() {
 void ImageSequencer2::initialize() {
 	assert(_instance == nullptr);
 	_instance = new ImageSequencer2;
+    _instance->_defaultCaptureImage = absPath("${OPENSPACE_DATA}/scene/common/textures/placeholder_blank.png");
 }
 
 void ImageSequencer2::deinitialize() {