{"data":{"mangoStatusCode":-1,"mangoStatusName":null,"localizedMessage":"Internal Server Error — com.serotonin.ShouldNeverHappenException: java.io.EOFException"},"status":500,"config":{"method":"GET","transformRequest":[null],"jsonpCallbackParam":"callback","timeout":{},"url":"/rest/v2/data-points","params":{},"headers":{"Accept":"application/json, text/plain, */*","X-Requested-With":"XMLHttpRequest","X-XSRF-TOKEN":"b622d220-b468-45f8-8a9c-8f37ce3a0079"},"cached":false},"statusText":"Server Error","xhrStatus":"complete","mangoStatusText":"Internal Server Error — com.serotonin.ShouldNeverHappenException: java.io.EOFException","mangoStatusTextShort":"Internal Server Error — com.serotonin.ShouldNeverHappenException: java.io.EOFException","resource":[]}
ERROR 2021-02-16T12:05:19,645 [main] - java.io.EOFException
com.serotonin.ShouldNeverHappenException: java.io.EOFException
        at com.serotonin.util.SerializationHelper.readObjectInContext(SerializationHelper.java:93) ~[mango-3.7.7.jar:?]
        at com.serotonin.m2m2.db.dao.DataSourceDao$DataSourceRowMapper.mapRow(DataSourceDao.java:146) ~[mango-3.7.7.jar:?]
        at com.serotonin.m2m2.db.dao.DataSourceDao$DataSourceExtractor.extractData(DataSourceDao.java:123) ~[mango-3.7.7.jar:?]
        at com.serotonin.m2m2.db.dao.DataSourceDao$DataSourceExtractor.extractData(DataSourceDao.java:115) ~[mango-3.7.7.jar:?]
        at org.springframework.jdbc.core.JdbcTemplate$1QueryStatementCallback.doInStatement(JdbcTemplate.java:439) ~[spring-jdbc-5.1.7.RELEASE.jar:5.1.7.RELEASE]
        at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:375) ~[spring-jdbc-5.1.7.RELEASE.jar:5.1.7.RELEASE]
        at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:451) ~[spring-jdbc-5.1.7.RELEASE.jar:5.1.7.RELEASE]
        at com.serotonin.db.DaoUtils.query(DaoUtils.java:254) ~[mango-3.7.7.jar:?]
        at com.serotonin.m2m2.db.dao.DataSourceDao.getDataSources(DataSourceDao.java:88) ~[mango-3.7.7.jar:?]
        at com.serotonin.m2m2.rt.RuntimeManagerImpl.initialize(RuntimeManagerImpl.java:134) ~[mango-3.7.7.jar:?]
        at com.serotonin.m2m2.Lifecycle.runtimeManagerInitialize(Lifecycle.java:791) ~[ma-priv-3.7.7.jar:?]
        at com.serotonin.m2m2.Lifecycle.initialize(Lifecycle.java:330) ~[ma-priv-3.7.7.jar:?]
        at com.serotonin.m2m2.Main.main(Main.java:159) ~[ma-priv-3.7.7.jar:?]
Caused by: java.io.EOFException
        at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2890) ~[?:?]
        at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:3385) ~[?:?]
        at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:942) ~[?:?]
        at java.io.ObjectInputStream.<init>(ObjectInputStream.java:385) ~[?:?]
        at com.serotonin.util.SerializationHelper$ClassLoaderObjectInputStream.<init>(SerializationHelper.java:138) ~[mango-3.7.7.jar:?]
        at com.serotonin.util.SerializationHelper.readObjectInContext(SerializationHelper.java:90) ~[mango-3.7.7.jar:?]
        ... 12 more

Has anyone seen this before??

EDIT: It gets worse. No users can access their data.... DAMNIT