sharing doenst work

i try to share my pics which is the most important part for my projekt.
it doesnt work
when i press the button it leads to https://www.facebook.com/sharer.php?u=https%3A%2F%2Ferzengel.help%2Fbwg_share%2Fimage%2F%3Fcurr_url%3Dhttps%253A%252F%252Ferzengel.help%252Fprojekte%252Fbitte-finde-mich%252Fbitte-finde-mich-suchseite%252F%26image_id%3D1%23bwg1%2F1 - page not found

cause it links to https://erzengel.help/bwg_share/image/?curr_url=https%3A%2F%2Ferzengel.help%2Fprojekte%2Fbitte-finde-mich%2Fbitte-finde-mich-suchseite%2F&image_id=1&fbclid=IwAR1RkVIdZ7M9xI-1_ONzsO4k0x0u_TLcjotqO_QL5wdmKUKwiRn9N8XQXg8#bwg1/1
and not to the page the gallery is in
what am i doing wrong?