java.lang.IllegalStateException - Updated schema has 2 entity types, but incoming schema has 2

Question

I am using object box in my project. I am getting this crash in firebase console. This is full error:

       at io.objectbox.BoxStore.nativeCreateWithFlatOptions(BoxStore.java)
       at io.objectbox.BoxStore.<init>(BoxStore.java:268)
       at io.objectbox.BoxStoreBuilder.build(BoxStoreBuilder.java:549)

I have not changed anything in my code. This crash is coming all of a sudden Anyone have any idea why this is coming? and any solution to this. I cannot find anything on net. Maybe this is issue is from object-box itself.