Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/15231
@felixcheung I just updated this and now it'd print the exceptions as below:
```r
> read.df(source="json")
Error in loadDF : analysis error - Unable to infer schema for JSON at . It
must be specified manually;
> read.df("arbitrary_path")
Error in loadDF : analysis error - Path does not exist: file:
.../arbitrary_path;
> write.df(df, source="csv")
Error in save : illegal argument - 'path' is not specified
```
Could you please take another look?
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