Getting this error ?

at java.util.AbstractList$Itr.checkForComodification(
at java.util.AbstractList$
This exception might be happened because of:

1. Doing an iteration over a collection that is being modified during the loop. For example:
for (Object object: list) {
2. Modifying the list at the same time (because List isn't thread safe). It can only happen either when the list object was declared static or singleton, or it's owned by a static or singleton object.

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