Could not find a train file at path for csv with multiline values

[marionebl]

Given the following input file

content,label
a
,0
b,1

and the tangram invocation

tangram train --file input.csv --target label --output output.tangram

the following error is produced

🤔 Inferring train table columns. 0B / 23B 0% 0ms elapsed
[                                                                              ]
error: Could not find a train file at path: "input.csv"
   0: backtrace::capture::Backtrace::new
   1: tangram_core::train::Trainer::prepare
   2: tangram::train::train::{{closure}}
   3: tangram::main
   4: std::sys_common::backtrace::__rust_begin_short_backtrace
   5: _main

---

A ; delimited mulitline csv yields a different exception

✅ Inferring train table columns. 0ms
✅ Loading train table. 0ms
✅ Shuffling. 0ms
✅ Computing train stats. 0ms
error: panicked at 'called `Result::unwrap()` on an `Err` value: Any', cli/train.rs:158:44
   0: backtrace::capture::Backtrace::new
   1: tangram::train::train::{{closure}}
   2: std::panicking::rust_panic_with_hook
   3: std::panicking::begin_panic_handler::{{closure}}
   4: std::sys_common::backtrace::__rust_end_short_backtrace
   5: _rust_begin_unwind
   6: core::panicking::panic_fmt
   7: core::option::expect_none_failed
   8: core::ptr::drop_in_place<core::option::Option<tangram::train::ProgressThread>>
   9: tangram::train::train::{{closure}}
  10: tangram::main
  11: std::sys_common::backtrace::__rust_begin_short_backtrace
  12: _main

   0: backtrace::capture::Backtrace::new
   1: tangram::main
   2: std::sys_common::backtrace::__rust_begin_short_backtrace
   3: _main

[isabella]

Hi @marionebl, thanks for filing this report! In version 0.3.0 tangram was providing a very poor message to CSV parsing errors. In version 0.4.0, the proper error message from the csv crate is now being bubbled up. Please re-open this issue if you continue to have a problem after upgrading. Thanks!