simple FTP Server EthernetEnc

Hello Mr. Mischianti, for an actual project I'm using your FTP server library on an custom ESP32 board. With wifi it works well. I have also an Ethernet extension with an ENC28J60 connected to the SPI interface. (EthernetENC library, similar to the Ethernet library) With this the FTP Server don't work, and when Wifi isn't activated the ESP starts in Boot Loop: assert failed: tcpip_send_msg_wait_sem IDF/components/lwip/lwip/src/api/tcpip.c:455 (Invalid mbox) Backtrace:0x40084105:0x3ffb24b00x4008db31:0x3ffb24d0 0x40092fd5:0x3ffb24f0 0x4010d48d:0x3ffb2620 0x4011f481:0x3ffb2650 0x4011f4e1:0x3ffb2670 0x4010cc51:0x3ffb26c0 0x400e0642:0x3ffb26e0 0x400e06bc:0x3ffb2730 0x400e2a79:0x3ffb2750 0x400d58b7:0x3ffb2780 0x400dde1b:0x3ffb27a0 0x400efc9e:0x3ffb2820 Is there a simple way to use this library with the ENC Ethernet? If yes, would it be possible that after compiling it works dependent of the used Wifi or Ethernet? Thanks Daniel van Aalst