--- a/pallets/common/src/erc.rs
+++ b/pallets/common/src/erc.rs
@@ -105,7 +105,7 @@
 			.confirm_sponsorship(caller.as_sub())
 			.map_err(dispatch_to_evm::<T>)?
 		{
-			return Err("Caller is not set as sponsor".into());
+			return Err("caller is not set as sponsor".into());
 		}
 		save(self)
 	}
@@ -136,7 +136,7 @@
 			}
 			_ => {
 				return Err(Error::Revert(format!(
-					"Unknown integer limit \"{}\"",
+					"unknown integer limit \"{}\"",
 					limit
 				)))
 			}
@@ -163,7 +163,7 @@
 			}
 			_ => {
 				return Err(Error::Revert(format!(
-					"Unknown boolean limit \"{}\"",
+					"unknown boolean limit \"{}\"",
 					limit
 				)))
 			}
@@ -244,11 +244,11 @@
 		collections: Vec<address>,
 	) -> Result<void> {
 		if collections.is_empty() {
-			return Err("No addresses provided".into());
+			return Err("no addresses provided".into());
 		}
 		if collections.len() >= OwnerRestrictedSet::bound() {
 			return Err(Error::Revert(format!(
-				"Out of bound: {} >= {}",
+				"out of bound: {} >= {}",
 				collections.len(),
 				OwnerRestrictedSet::bound()
 			)));
@@ -261,7 +261,7 @@
 					let mut bv = OwnerRestrictedSet::new();
 					for i in collections {
 						bv.try_insert(crate::eth::map_eth_to_id(&i).ok_or_else(|| {
-							Error::Revert("Can't convert address into collection id".into())
+							Error::Revert("can't convert address into collection id".into())
 						})?)
 						.map_err(|e| Error::Revert(format!("{:?}", e)))?;
 					}
@@ -286,7 +286,7 @@
 			access: Some(match mode {
 				0 => AccessMode::Normal,
 				1 => AccessMode::AllowList,
-				_ => return Err("Not supported access mode".into()),
+				_ => return Err("not supported access mode".into()),
 			}),
 			..Default::default()
 		};
--- a/tests/src/eth/contractSponsoring.test.ts
+++ b/tests/src/eth/contractSponsoring.test.ts
@@ -233,7 +233,7 @@
     const ss58Format = (api.registry.getChainProperties())!.toJSON().ss58Format;
     expect(collectionSub.sponsorship.isUnconfirmed).to.be.true;
     expect(collectionSub.sponsorship.asUnconfirmed.toHuman()).to.be.eq(evmToAddress(sponsor, Number(ss58Format)));
-    await expect(collectionEvm.methods.confirmCollectionSponsorship().call()).to.be.rejectedWith('Caller is not set as sponsor');
+    await expect(collectionEvm.methods.confirmCollectionSponsorship().call()).to.be.rejectedWith('caller is not set as sponsor');
 
     await collectionEvm.methods.confirmCollectionSponsorship().send({from: sponsor});
     collectionSub = (await getDetailedCollectionInfo(api, collectionId))!;
@@ -302,7 +302,7 @@
     const ss58Format = (api.registry.getChainProperties())!.toJSON().ss58Format;
     expect(collectionSub.sponsorship.isUnconfirmed).to.be.true;
     expect(collectionSub.sponsorship.asUnconfirmed.toHuman()).to.be.eq(evmToAddress(sponsor, Number(ss58Format)));
-    await expect(collectionEvm.methods.confirmCollectionSponsorship().call()).to.be.rejectedWith('Caller is not set as sponsor');
+    await expect(collectionEvm.methods.confirmCollectionSponsorship().call()).to.be.rejectedWith('caller is not set as sponsor');
     const sponsorCollection = evmCollection(web3, sponsor, collectionIdAddress);
     await sponsorCollection.methods.confirmCollectionSponsorship().send();
     collectionSub = (await getDetailedCollectionInfo(api, collectionId))!;
--- a/tests/src/eth/createCollection.test.ts
+++ b/tests/src/eth/createCollection.test.ts
@@ -80,7 +80,7 @@
     expect(collectionSub.sponsorship.isUnconfirmed).to.be.true;
     const ss58Format = (api.registry.getChainProperties())!.toJSON().ss58Format;
     expect(collectionSub.sponsorship.asUnconfirmed.toHuman()).to.be.eq(evmToAddress(sponsor, Number(ss58Format)));
-    await expect(collectionEvm.methods.confirmCollectionSponsorship().call()).to.be.rejectedWith('Caller is not set as sponsor');
+    await expect(collectionEvm.methods.confirmCollectionSponsorship().call()).to.be.rejectedWith('caller is not set as sponsor');
     const sponsorCollection = evmCollection(web3, sponsor, collectionIdAddress);
     await sponsorCollection.methods.confirmCollectionSponsorship().send();
     collectionSub = (await getDetailedCollectionInfo(api, collectionId))!;
@@ -208,7 +208,7 @@
       const sponsorCollection = evmCollection(web3, sponsor, collectionIdAddress);
       await expect(sponsorCollection.methods
         .confirmCollectionSponsorship()
-        .call()).to.be.rejectedWith('Caller is not set as sponsor');
+        .call()).to.be.rejectedWith('caller is not set as sponsor');
     }
     {
       await expect(contractEvmFromNotOwner.methods
@@ -225,6 +225,6 @@
     const collectionEvm = evmCollection(web3, owner, collectionIdAddress);
     await expect(collectionEvm.methods
       .setCollectionLimit('badLimit', 'true')
-      .call()).to.be.rejectedWith('Unknown boolean limit "badLimit"');
+      .call()).to.be.rejectedWith('unknown boolean limit "badLimit"');
   });
 });
\ No newline at end of file