Improve error message for expected String (#1492)

* Improve error message for expected String * Add changelog entry
use-ink · Feb 5, 2024 · 744babf · 744babf
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 ### Added
+- Improved error message for Strings as CLI arguments - [#1492](https://github.com/paritytech/cargo-contract/pull/1492)
 - Add a user-friendly view of contract storage data in the form of a table - [#1414](https://github.com/paritytech/cargo-contract/pull/1414)
 - Add `rpc` command - [#1458](https://github.com/paritytech/cargo-contract/pull/1458)
 

diff --git a/crates/transcode/src/encode.rs b/crates/transcode/src/encode.rs
@@ -284,7 +284,9 @@ impl<'a> Encoder<'a> {
                     s.encode_to(output);
                     Ok(())
                 } else {
-                    Err(anyhow::anyhow!("Expected a String value"))
+                    Err(anyhow::anyhow!("Expected a String value\n\
+                    On the command-line, String values need to be wrapped in escaped quotes: \
+                    \\\"…\\\"."))
                 }
             }
             TypeDefPrimitive::U8 => encode_uint::<u8, O>(value, "u8", output),