I can send you the whole log, but here's a quick snippet:

I0920 10:35:28.888785   32735 source_eval.go:648] ResourceMonitor.RegisterResource operation finished: t=aws:sns/topic:Topic, urn=urn:pulumi:bi
lling-dev::billing::aws:sns/topic:Topic::billing-notifications, stable=true, #stables=0 #outs=18
I0920 10:35:28.888884   32735 provider_plugin.go:244] Provider[aws, 0xc4207fab40].Check(urn:pulumi:billing-dev::billing::aws:lambda/function:Function::slacker) failed: err=expected an asset, but filename is not an asset
I0920 10:35:28.888904   32735 plan_executor.go:166] planExecutor.Execute(...): error handling event: expected an asset, but filename is not an asset
I0920 10:35:28.888932   32735 eventsink.go:87] eventSink::Error(<{%fg 7%}>expected an asset, but filename is not an asset<{%reset%}>)
I0920 10:35:28.888972   32735 step_executor.go:248] StepExecutor worker(-1): StepExecutor.waitForCompletion(): waiting for worker threads to exit
I0920 10:35:28.888999   32735 step_executor.go:248] StepExecutor worker(0): worker exiting due to cancellation
I0920 10:35:28.889002   32735 step_executor.go:248] StepExecutor worker(6): worker exiting due to cancellation
I0920 10:35:28.889007   32735 step_executor.go:248] StepExecutor worker(7): worker exiting due to cancellation
I0920 10:35:28.889021   32735 step_executor.go:248] StepExecutor worker(4): worker exiting due to cancellation
I0920 10:35:28.889037   32735 step_executor.go:248] StepExecutor worker(5): worker exiting due to cancellation
I0920 10:35:28.889048   32735 step_executor.go:248] StepExecutor worker(3): worker exiting due to cancellation
I0920 10:35:28.889034   32735 step_executor.go:248] StepExecutor worker(9): worker exiting due to cancellation
I0920 10:35:28.889023   32735 step_executor.go:248] StepExecutor worker(8): worker exiting due to cancellation
I0920 10:35:28.889054   32735 step_executor.go:248] StepExecutor worker(2): worker exiting due to cancellation
I0920 10:35:28.889065   32735 step_executor.go:248] StepExecutor worker(1): worker exiting due to cancellation
 *  global global no change 1 error. error: expected an asset, but filename is not an asset
I0920 10:35:28.889132   32735 plan_executor.go:183] planExecutor.Execute(...): step executor has completed
I0920 10:35:28.889283   32735 plan_executor.go:71] planExecutor.Execute(...): exiting provider canceller
 *  global global no change 1 error

I0920 10:35:2  global: global
    error: expected an asset, but filename is not an asset