Typically if you've added new components the component processor will add the entries automatically to the AutogeneratedOdeMessages file, which is a parent interface of OdeMessages, so it is unnecessary to manually add the entries to OdeMessages. Can you verify that AutogeneratedOdeMessages was updated in the build artifacts?
Follow @ewpatton 's suggestion or a temp fix may be
@DefaultMessage("")
@Description("Just to make ai2 compile :D")
String adSizeParams();
@DefaultMessage("")
@Description("Just to make ai2 compile :D")
String strParams();
@DefaultMessage("")
@Description("Just to make ai2 compile :D")
String iParams();
@DefaultMessage("")
@Description("Just to make ai2 compile :D")
String adsNumberParams();
@DefaultMessage("")
@Description("Just to make ai2 compile :D")
String primaryImageSizeParams();
@DefaultMessage("")
@Description("Just to make ai2 compile :D")
String secondaryImageSizeParams();
@DefaultMessage("")
@Description("Just to make ai2 compile :D")
String secondaryImageSizeParams();
Now getting 100s of error ... i am showing only 1 for refernce
[javac] symbol: method appLovinInterstitialComponentPallette()
[javac] location: variable MESSAGES of type OdeMessages
[javac] E:\appinventor-sources\appinventor\build\components\ComponentTranslation\src\com\google\appinventor\client\ComponentsTranslation.java:370: error: cannot find symbol
[javac] map.put("AppLovinInterstitial-helpString", MESSAGES.AppLovinInterstitialHelpStringComponentPallette());
[javac] ^
[javac] symbol: method AppLovinInterstitialHelpStringComponentPallette()
[javac] location: variable MESSAGES of type OdeMessages
[javac] Note: Some input files use or override a deprecated API.
[javac] Note: Recompile with -Xlint:deprecation for details.
[javac] Note: Some input files use unchecked or unsafe operations.
[javac] Note: Recompile with -Xlint:unchecked for details.
[javac] 100 errors