No access to clone

[OPS]

I am trying to modify one of my exisiting databases. I firstly clone the old database they I want to rename it as=nd mnodufy a few layouts for a new business.

 

I have managed to clone it, but I simply cannot open the clone. 

I just get an error that Filemaker is unable to write to this file. No idea why, file permissions are correct.

 

Anyone else seen this? I have recreated the file, moved it to different folders etc. This is using Filemaker Advanced 16.

Edited August 22, 2019 by OPS

[comment]

That does not look like a FileMaker error message. Did you develop this solution yourself?

[OPS]

I have just saved it again as a clone and I get exactly the same message. Very odd. I have even copied it to my desktop and same issue. The message is one one I have written, it seems like it is a filemaker one. No idea whyb I cant open it.