Hi All, I faced a problem after I tested the Bio-Blend API. I cannot access the history anymore with the below error messages. Although, I tried installation from the scratch, but I got the same error message. Please let me know how to fix this problem. Thanks! (GALAXY User Interface) ======================================================= "xhr": { "readyState": 4, "responseText": "{\"err_msg\": \"Uncaught exception in exposed API method:\", \"err_code\": 0}", "responseJSON": { "err_msg": "Uncaught exception in exposed API method:", "err_code": 0 }, "status": 500, "statusText": "Internal Server Error", "responseHeaders": { "Date": "Wed, 03 Dec 2014 15:50:02 GMT\r", "cache-control": "max-age=0,no-cache,no-store\r", "Server": "PasteWSGIServer/0.5 Python/2.7.8\r", "Connection": "close\r", "content-type": "application/json\r" } ======================================================= I found the error message in the Galaxy instance shell interface. ======================================================= galaxy.web.framework.decorators ERROR 2014-12-03 10:50:02,279 Uncaught exception in exposed API method: Traceback (most recent call last): File "/home/bxp12/galaxy-dist/lib/galaxy/web/framework/decorators.py", line 244, in decorator rval = func( self, trans, *args, **kwargs) File "/home/bxp12/galaxy-ist/lib/galaxy/webapps/galaxy/api/history_contents.py", line 76, in index and ( history_id == trans.security.encode_id( trans.history.id ) ) ): AttributeError: 'NoneType' object has no attribute 'id' ======================================================= Best, Bongsoo