File not found when include external file from argument.[Bash]

I must be missing something about include external file to my bash file.

In my scenario I have the following command

sh exec.sh env_local.conf ebis_tag

It showed the error

exec.sh: line 30: .: env_local.conf: file not found

My following exec.sh script is:

#!/bin/bash

usage_exit() {
        echo "Usage: $0 [-b] env_file_path project_name" 1>&2
        exit 1
}

# default BANG_RUNNING="FALSE"
BANG_RUNNING="FALSE"

while getopts b OPT
do
  case $OPT in
    b) BANG_RUNNING="TRUE" ;;
    ¥?) usage_exit;
  esac
done

shift $(($OPTIND - 1))

if [ $# -ne 2 ]; then
  echo $#;
  usage_exit;
fi

# import env_file
# CORE_HOST
# REF_HOST
# ADMASTER_HOST
. $1

exec.sh and env_local.config are in same directory

[root@6d4f1e2363eb makedb]# ls -l
total 81
-rwxrwxrwx 1 1000 ftp  3381 Mar 14 09:03 admaster.sql
-rwxrwxrwx 1 1000 ftp  1675 Mar 29 03:02 ebisdata.sql
-rwxrwxrwx 1 1000 ftp 51278 Mar 29 02:16 ebis.sql
-rwxrwxrwx 1 1000 ftp    83 Mar 29 02:18 env_local.conf
-rwxrwxrwx 1 1000 ftp    93 Mar 14 09:03 env_stg.conf
-rwxrwxrwx 1 1000 ftp  7233 Mar 29 03:01 exec.sh
-rwxrwxrwx 1 1000 ftp  5854 Mar 14 09:03 README.md
-rwxrwxrwx 1 1000 ftp 10481 Mar 14 09:03 refdb.sql
drwxrwxrwx 1 1000 ftp     0 Mar 14 09:03 update
[root@6d4f1e2363eb makedb]#

Did I miss something?