WiFiManager multiple definition

Hi community,
after installing 1.8.10 and trying to use wifimanager-esp32 i get a lot error messages all saying almost the same:

libraries\WiFiManager\WiFiManager.cpp.o: In function `WiFiManager::handleInfo()':

c:\users\franz\appdata\local\arduino15\packages\esp32\tools\xtensa-esp32-elf-gcc\1.22.0-80-g6c4433a-5.2.0\xtensa-esp32-elf\include\c++\5.2.0/functional:2252: multiple definition of `WiFiManager::handleInfo()'

libraries\WiFiManager\WiFiManager-esp32.cpp.o:C:\Users\Franz\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.3\libraries\WiFi\src/WiFiClient.h:31: first defined here

libraries\WiFiManager\WiFiManager.cpp.o: In function `WiFiManager::handleReset()':

WiFiManager.cpp:(.text._ZN11WiFiManager11handleResetEv+0x0): multiple definition of `WiFiManager::handleReset()'

libraries\WiFiManager\WiFiManager-esp32.cpp.o:WiFiManager-esp32.cpp:(.text._ZN11WiFiManager11handleResetEv+0x0): first defined here

libraries\WiFiManager\WiFiManager.cpp.o: In function `WiFiManager::handleWifiSave()':

WiFiManager.cpp:(.text._ZN11WiFiManager14handleWifiSaveEv+0x0): multiple definition of `WiFiManager::handleWifiSave()'

libraries\WiFiManager\WiFiManager-esp32.cpp.o:WiFiManager-esp32.cpp:(.text._ZN11WiFiManager14handleWifiSaveEv+0x0): first defined here

libraries\WiFiManager\WiFiManager.cpp.o: In function `WiFiManagerParameter::WiFiManagerParameter(char const*)':

... and so on...

I reinstalled 1.8.9, tried other wifimanager libraries, but nothing helped. Also the simple examples for wifimanager show the same error picture.
Is anybody around who could give me a solutuion or helpful hints?
Thanks a lot in advance!

Somehow both wifimanager.cpp and wifmanager-esp32.cpp are included, don't know how you managed that. they appear to be in the same folder, though that is not a certainty. I would uninstall Wifimanager and make sure all files belonging to it are removed (check the sketch folder) and then reinstall it (preferably using the library manager otherwise just from github)