!! warn: 0 CLEARED by call to connect method
    <- connect('TestMMDB:localhost', 'user', ...)= ( DBI::db=HASH(0x18
+88a5c)
 ) [1 items] at DBI.pm line 658
    <- STORE('PrintError', 1)= ( 1 ) [1 items] at DBI.pm line 710
    <- STORE('AutoCommit', 1)= ( 1 ) [1 items] at DBI.pm line 710
    <- STORE('Username', 'user')= ( 1 ) [1 items] at DBI.pm line 713
    <- connected('dbi:mysql:TestMMDB:localhost', 'user', ...)= ( undef
+ ) [1
items] at DBI.pm line 720
    <- connect= DBI::db=HASH(0x1888a5c)
    <- STORE('dbi_connect_closure', CODE(0x1896404))= ( 1 ) [1 items] 
+at DBI.pm
line 729
    <- prepare('LOAD DATA INFILE ? INTO TABLE ? FIELDS TERMINATED BY '
+,' (Date,Symbol,Open,High,Low,Close,Volume)')= ( DBI::st=HASH(0x1889b
+b4) ) [1 items] at te
st.pl line 33
    <- execute('D:\NickD\Project\StockData\PriceAMS_2013-10-13.csv', '
+TestMMDB.PriceAMS')= ( undef ) [1 items] at test.pl line 34
    <- errstr= ( undef ) [1 items] at test.pl line 34
Use of uninitialized value in concatenation (.) or string at test.pl l
+ine 34.

Oops!: Can't execute the query : at test.pl line 34.
    <- DESTROY(DBI::st=HASH(0x1889df4))= ( undef ) [1 items] at test.p
+l line 34
    <- DESTROY(DBI::db=HASH(0x1888c0c))= ( undef ) [1 items] at test.p
+l line 34
    <- disconnect_all= ( ) [0 items] (not implemented) at DBI.pm line 
+737
!   <- DESTROY(DBI::dr=HASH(0x18964b4))= ( undef ) [1 items] during gl
+obal destruction
[download]

You can't use prepared statements for load infile, you need to do a direct do() call.