1 Build Crashed, and another is still Pending

My automated builds are behaving badly,the first one errored out with an exception and the next one is just pending.
also previous builds were behaving badly in that they were not triggering webhooks.

here is the error from the failed build

Worker Job Exception: 500 Server Error: Unable to open the database file: unable to open database file : [' File "/highland/highland/tx/worker/runner.py", line 59, in parachute\n yield self.execute_job(data)\n', ' File "/highland/src/twisted/twisted/internet/defer.py", line 1126, in _inlineCallbacks\n result = result.throwExceptionIntoGenerator(g)\n', ' File "/highland/src/twisted/twisted/python/failure.py", line 389, in throwExceptionIntoGenerator\n return g.throw(self.type, self.value, self.tb)\n', ' File "/highland/highland/tx/worker/runner.py", line 104, in execute_job\n container_id = yield self.create_container(build_code)\n', ' File "/highland/src/twisted/twisted/internet/defer.py", line 1126, in _inlineCallbacks\n result = result.throwExceptionIntoGenerator(g)\n', ' File "/highland/src/twisted/twisted/python/failure.py", line 389, in throwExceptionIntoGenerator\n return g.throw(self.type, self.value, self.tb)\n', ' File "/highland/highland/tx/worker/runner.py", line 161, in create_container\n result = yield self.daemon.dc.create_container(config, "build_{}".format(build_code))\n', ' File "/highland/src/twisted/twisted/internet/defer.py", line 588, in _runCallbacks\n current.result = callback(current.result, *args, **kw)\n', ' File "/highland/highland/tx/docker.py", line 491, in done\n self.assert_code(response.code, content)\n', ' File "/highland/highland/tx/docker.py", line 172, in assert_code\n raise RuntimeError(\'{} Server Error: {}\'.format(code, message))\n']