QSslSocket: cannot resolve CRYPTO_num_locks

I'm trying to use wkhtmltopdf to render a PDF page from HTML. When I try to call Create, it gives me bunch of errors regarding QSslSocket: cannot resolve. Anyone knows what's happening here?

func main() {
  tmpl, _ := template.ParseFiles("docs/template.html")
  if err != nil {
    fmt.Println(err)
  }

  tempBuff := new(bytes.Buffer)

  err = tmpl.Execute(tempBuff, data)
  if err != nil {
    fmt.Println(err)
  }

  page := wkhtmltopdf.NewPageReader(tempBuff)

  pdfGen, err := wkhtmltopdf.NewPDFGenrator()
  if err != nil {
    fmt.Println(err)
  }

  pdfGen.AddPage(page)
  pdfGen.Orientation.Set(wkhtmltopdf.OrientationLandscape)
  pdfGen.Dpi.Set(300)

  // Error happens here
  err = pdfGen.Create()
  if err != nil {
    fmt.Println(err)
  }
}

These are the errors

Loading pages (1/6)
QSslSocket: cannot resolve CRYPTO_num_locks                  ] 10%
QSslSocket: cannot resolve CRYPTO_set_id_callback
QSslSocket: cannot resolve CRYPTO_set_locking_callback
QSslSocket: cannot resolve sk_free
QSslSocket: cannot resolve sk_num
QSslSocket: cannot resolve sk_pop_free
QSslSocket: cannot resolve sk_value
QSslSocket: cannot resolve SSL_library_init
QSslSocket: cannot resolve SSL_load_error_strings
QSslSocket: cannot resolve SSLv3_client_method
QSslSocket: cannot resolve SSLv23_client_method
QSslSocket: cannot resolve SSLv3_server_method
QSslSocket: cannot resolve SSLv23_server_method
QSslSocket: cannot resolve X509_STORE_CTX_get_chain
QSslSocket: cannot resolve OPENSSL_add_all_algorithms_noconf
QSslSocket: cannot resolve OPENSSL_add_all_algorithms_conf
QSslSocket: cannot resolve SSLeay
QSslSocket: cannot call unresolved function CRYPTO_num_locks
QSslSocket: cannot call unresolved function CRYPTO_set_id_callback
QSslSocket: cannot call unresolved function CRYPTO_set_locking_callback
QSslSocket: cannot call unresolved function SSL_library_init
QSslSocket: cannot call unresolved function SSLv23_client_method
QSslSocket: cannot call unresolved function sk_num
QSslSocket: cannot call unresolved function SSLv23_client_method2%
QSslSocket: cannot call unresolved function SSL_library_init
Counting pages (2/6)                                               
Resolving links (4/6)                                                       
Loading headers and footers (5/6)                                           
Printing pages (6/6)
Done                                                                      
Exit with code 1 due to network error: UnknownNetworkError
QSslSocket: cannot call unresolved function CRYPTO_num_locks
QSslSocket: cannot call unresolved function CRYPTO_set_id_callback
QSslSocket: cannot call unresolved function CRYPTO_set_locking_callback

You need to use a more recent version of wkhtmltopdf, at least 0.12.5.

I found this and it fixed the problem trying to run wkhtmltopdf on Oracle LINUX:

sudo -i yum install compat-openssl10.x86_64

I was using 0.12.4 and upgraded to 0.12.6. Solved it for me!

wkhtmltopdf.org/downloads.html

install guide on computingforgeeks.com