SqlDataAdapter And DataSet

I'm getting a strange error with my dataadapter.  Here's my code:
  using (SqlConnection conn = new SqlConnection(
ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString))
{
SqlDataAdapter da = new SqlDataAdapter("sprocCUSTOM", conn);
da.SelectCommand.Parameters.AddWithValue("@eventID", EventID);

conn.Open(); //open connection
DataSet ds = new DataSet();
da.Fill(ds);
gvAttendees.DataSource = ds;
gvAttendees.DataBind();
}
This is the error I'm getting:
 Incorrect syntax near 'sprocCUSTOM'.
But the error is highlighted at the line that reads "da.Fill(ds);"
There's nothing wrong with the stored procedure either.  It exists and works fine.