I'm having this random issue. When trying to add an app or a page on any of my site collections i get this error:

Could not load file or assembly 'App_Web_errorv15.master.9c9699a8.tism8wyx, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The parameter is incorrect. (Exception from HRESULT: 0x80070057 (E_INVALIDARG))

I checked the logs and i find the same error msg on there:

05/04/2017 12:14:31.38 w3wp.exe (0x0BDC) 0x1E14 SharePoint Foundation General ajlz0 High Getting Error Message for Exception System.Web.HttpParseException (0x80004005): Could not load file or assembly 'App_Web_errorv15.master.9c9699a8.rkml6usk, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The parameter is incorrect. (Exception from HRESULT: 0x80070057 (E_INVALIDARG)) ---> System.Web.HttpParseException (0x80004005): Could not load file or assembly 'App_Web_errorv15.master.9c9699a8.rkml6usk, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The parameter is incorrect. (Exception from HRESULT: 0x80070057 (E_INVALIDARG)) ---> System.IO.FileLoadException: Could not load file or assembly 'App_Web_errorv15.master.9c9699a8.rkml6usk, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. ... f670ee9d-19e0-70c4-ffb0-92253840f919

Any ideas as to why this is happening?

I'm having this random issue. When trying to add an app or a page on any of my site collections i get this error:

Could not load file or assembly 'App_Web_errorv15.master.9c9699a8.tism8wyx, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The parameter is incorrect. (Exception from HRESULT: 0x80070057 (E_INVALIDARG))

I checked the logs and I find the same error msg on there:

05/04/2017 12:14:31.38 w3wp.exe (0x0BDC)
0x1E14 SharePoint Foundation General
ajlz0 High Getting Error Message for Exception System.Web.HttpParseException (0x80004005): Could not load file or assembly 'App_Web_errorv15.master.9c9699a8.rkml6usk, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The parameter is incorrect. (Exception from HRESULT: 0x80070057 (E_INVALIDARG)) ---> System.Web.HttpParseException (0x80004005): Could not load file or assembly 'App_Web_errorv15.master.9c9699a8.rkml6usk, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The parameter is incorrect. (Exception from HRESULT: 0x80070057 (E_INVALIDARG)) ---> System.IO.FileLoadException: Could not load file or assembly 'App_Web_errorv15.master.9c9699a8.rkml6usk, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. ... f670ee9d-19e0-70c4-ffb0-92253840f919

Any ideas as to why this is happening?