I've got to assume that's the source of this?
$ grep -Rni "bug" * | arc paste --title "Location of all bugs" libphutil loaded from '/home/builderc/integrator/phacility/libphutil/src'. arcanist loaded from '/home/builderc/integrator/phacility/arcanist/src'. Config: Reading user configuration file "/home/builderc/.arcrc"... Config: Reading system configuration file "/etc/arcconfig"... Working Copy: Reading .arcconfig from "/home/builderc/janitorial-services/.arcconfig". Working Copy: Path "/home/builderc/janitorial-services" is part of `git` working copy "/home/builderc/janitorial-services". Working Copy: Project root is at "/home/builderc/janitorial-services". Config: Did not find local configuration at "/home/builderc/janitorial-services/.git/arc/config". Loading phutil library from '/home/builderc/integrator/client/source'... Loading phutil library from '/home/builderc/janitorial-services/source'... >>> [0] <conduit> user.whoami() <bytes = 117> >>> [1] <http> http://secret/api/user.whoami <<< [1] <http> 88,288 us <<< [0] <conduit> 88,762 us >>> [2] <conduit> paste.create() <bytes = 193> >>> [3] <http> http://secret/api/paste.create <<< [3] <http> 86,285 us <<< [2] <conduit> 86,621 us [2015-11-08 05:26:56] EXCEPTION: (HTTPFutureHTTPResponseStatus) [HTTP/500] Internal Server Error {"result":null,"error_code":"ERR-CONDUIT-CORE","error_info":"Transactions have no effect:\n - Transaction has no effect."} at [<phutil>/src/future/http/BaseHTTPFuture.php:339] arcanist(custom=1), integrator-client(), janitorial-services(head=master, ref.master=2fe40487b1b3), phutil() #0 BaseHTTPFuture::parseRawHTTPResponse(string) called at [<phutil>/src/future/http/HTTPSFuture.php:415] #1 HTTPSFuture::isReady() called at [<phutil>/src/future/Future.php:37] #2 Future::resolve(NULL) called at [<phutil>/src/future/FutureProxy.php:34] #3 FutureProxy::resolve() called at [<phutil>/src/conduit/ConduitClient.php:58] #4 ConduitClient::callMethodSynchronous(string, array) called at [<arcanist>/src/workflow/ArcanistPasteWorkflow.php:135] #5 ArcanistPasteWorkflow::createPaste() called at [<arcanist>/src/workflow/ArcanistPasteWorkflow.php:94] #6 ArcanistPasteWorkflow::run() called at [<arcanist>/scripts/arcanist.php:382]
You can repro this just by typing "test" into the conduit console and trying to call the method. I wouldn't be surprised if you already knew about this.