Cannot Create Table after Lowercased all text in MySQL Dump file - mysql

Question

I'm having an error restoring tables which have Foreign Keys after lowercasing the contents of a mysql dump file.
My goal is to lowercase all structure in a mysql database.
I used vim to lowercase all contents of a mysqldump file when trying to restore the database, this is the error I get.
$ mysql -u [user] -p[password] dme < mysqldump.sql
ERROR 1005 (HY000) at line 399: Can't create table 'dme.contacts' (errno: 121)
The restore is error'ing out on any table which has Foreign Key contstraints. If I remove lines after the Primary Key for each table, the entire restore works fine.
My question is, what is causing this and how can I keep my Foreign Keys in the process?
Lowercased.sql example which results in the error (fyi prior to dme.contacts there are multiple tables which are created just fine. Only tables w/ Foreign Keys and Contstraints have issues.)
drop table if exists `contacts`;
/*!40101 set #saved_cs_client = ##character_set_client */;
/*!40101 set character_set_client = utf8 */;
create table `contacts` (
`contactid` int(11) not null auto_increment,
`firstname` varchar(100) default null,
`lastname` varchar(100) not null,
`fullname` varchar(200) not null,
`dob` datetime default null,
`sex` char(1) default null,
`voided` datetime default null,
`vendorid` int(11) not null,
`contacttypeid` int(11) default null,
`comments` varchar(1500) default null,
primary key (`contactid`),
key `fk_contacts_vendors` (`vendorid`),
key `fk_contacts_contacttype` (`contacttypeid`),
constraint `fk_contacts_contacttype` foreign key (`contacttypeid`) references `contacttype` (`contacttypeid`) on delete no action on update no action,
constraint `fk_contacts_vendors` foreign key (`vendorid`) references `vendors` (`vendorid`) on delete no action on update no action
) engine=innodb default charset=utf8;
/*!40101 set character_set_client = #saved_cs_client */;
--
-- dumping data for table `contacts`
--
lock tables `contacts` write;
/*!40000 alter table `contacts` disable keys */;
/*!40000 alter table `contacts` enable keys */;
unlock tables;
Original from the mysqldump.sql (No Error)
--
-- Table structure for table `Contacts`
--
DROP TABLE IF EXISTS `Contacts`;
/*!40101 SET #saved_cs_client = ##character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `Contacts` (
`ContactId` int(11) NOT NULL AUTO_INCREMENT,
`FirstName` varchar(100) DEFAULT NULL,
`LastName` varchar(100) NOT NULL,
`FullName` varchar(200) NOT NULL,
`DOB` datetime DEFAULT NULL,
`Sex` char(1) DEFAULT NULL,
`Voided` datetime DEFAULT NULL,
`VendorID` int(11) NOT NULL,
`ContactTypeID` int(11) DEFAULT NULL,
`Comments` varchar(1500) DEFAULT NULL,
PRIMARY KEY (`ContactId`),
KEY `FK_Contacts_Vendors` (`VendorID`),
KEY `FK_Contacts_ContactType` (`ContactTypeID`),
CONSTRAINT `FK_Contacts_ContactType` FOREIGN KEY (`ContactTypeID`) REFERENCES `ContactType` (`ContactTYpeID`) ON DELETE NO ACTION ON UPDATE NO ACTION,
CONSTRAINT `FK_Contacts_Vendors` FOREIGN KEY (`VendorID`) REFERENCES `Vendors` (`VendorId`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
/*!40101 SET character_set_client = #saved_cs_client */;
--
-- Dumping data for table `Contacts`
--
LOCK TABLES `Contacts` WRITE;
/*!40000 ALTER TABLE `Contacts` DISABLE KEYS */;
/*!40000 ALTER TABLE `Contacts` ENABLE KEYS */;
UNLOCK TABLES;

Answer 1

Try removing the constrain name. Sample:
constraint `fk_contacts_contacttype` foreign key (`contacttypeid`) ....
To
constraint foreign key (`contacttypeid`) ...