ORA-06512: at “”MDSYS.SDO_INDEX_METHOD_10I””

I hit with that error message during the export&import process on 12c database on Linux While I am checking import log, I noticed below error message: ORA-13249: Error in R-tree: [mdrcrtscrt] ORA-13231: failed to create index table [MY_OBJECT$] during R-tree creation ORA-13249: Stmt-Execute Failure: CREATE TABLE “MY_SCHEMA”.”MY_OBJECT$”(NODE_ID NUMBER,NODE_LEVEL NUMBER,INFO BLOB) LOB (INFO) STORE ORA-39083: Object Continue reading