Filesystem is ok and version is NodeMCU 0.9.5 build 20150318 and that should work according to the comment from Vowstar.
So something seems to be corrupt.
Ps I watched a lot of youtube videos and read a lot of webpages, But I never saw anyone using SIO mode. So always used DIO mode.
Hope this extra info will help solve the problem.
Rgds,
Robert.