Euclidean Distance Failed to execute. Error 000867

[RobWard1]

When trying to calculate the Euclidean Distance to Point features in ArcGIS Pro 2.3.1, I am suddenly receiving the following errors (only started happening today):

Euclidean Distance failed. 

Parameters
Input raster or feature source data Pm_nectar
Output distance raster C:\Test\EucDist_shp1
Maximum distance
Output cell size 25
Output direction raster
Distance Method PLANAR

Environments
Cell Size 25

Messages
Start Time: 19 March 2019 18:06:52
Failed to execute. Parameters are not valid.
ERROR 000867: Environment: contains invalid cell size or dataset.
Failed to execute (EucDistance).
Failed at 19 March 2019 18:06:52 (Elapsed Time: 0.06 seconds)

I have tried altering the output file extension, file path of both the source and output files (in both folders and geodatabases), altering the cell size, the coordinate system of the source point and output files  and the cell size project method to no avail. Comparably, running it in ArcMap 10.5.1 works without issue.
Any ideas?

Some details on the input point feature:

Data Type: Shapefile Feature Class

Geometry type: Point

Vertical Units: Meter

Spatial Reference:

Projected Coordinate System: British National Grid

Projection: Transverse Mercator

Many thanks,
Rob

[RobWard1]

As an update I am also experiencing the same issue with the 'Point Density' tool (exactly the same error message).
As a workaround I have been carrying out the analyses in ArcMap instead.

[BrianGelder1]

I was receiving the same error using arcpy. Once I took a deep enough look I realized my workspace was mistakenly trying to create a scratchGDB inside a feature class inside a File Geodatabase. It was trying to create a raster than ended in .afr inside the default workspace for the user. Once I fixed that insanity it worked correctly.

[BrianGelder1]

I received this error another time and it was due to a snap raster that did not exist. I fixed that and no more Error 000867

[KristalWalsh]

That was definitely part of the problem! Cannot ignore the environment settings. On to the next error. LOL!