Help: startup-config file open failed (Not enough space)

Question

Who can help me ? I've an uc500 and he stil running. Now i want to change something and want to save the configuration first. But the following message appears : startup-config file open failed (Not enough space)
this is the output from a dir flash:
Directory of nvram:/
  227  -rw-       25897                    <no date>  startup-config
  228  ----        1933                    <no date>  private-config
  229  -rw-       25897                    <no date>  underlying-config
    1  ----          83                    <no date>  persistent-data
    2  -rw-           0                    <no date>  ifIndex-table
    3  -rw-         577                    <no date>  IOS-Self-Sig#1.cer
    4  -rw-         615                    <no date>  IOS-Self-Sig#2.cer
    5  -rw-         660                    <no date>  vlan.dat
    6  -rw-         107                    <no date>  cca.xml
    7  -rw-         586                    <no date>  IOS-Self-Sig#3.cer
262144 bytes total (227094 bytes free)

Answer 1

OK.
Try this:
conf t
service compress-config
And see if that helps. 
If not, see if you can tftp the running config off the router and TFTP it back to startup-config:
copy run tftp
copy tftp start
Then you can try a reload and see if it is cured.
I googled and found a few cases where alot of ACLs or NAT rules could cause MALOC errors (you would see those in your logs) when implemented and could manifest itself in this condition, which could be cured after the next reload, which is why I suggested that.
Of course, dont be remote when you do this and only do it during a maintenance window.
Steve